I try to make this very long story short..

I used to have a simple flip phone and a retention plan which was $40
including 750 anytime minutes and free wireless web.  I thought it was
a fair deal.  

Last August my phone crashed and I lost all my stored #'s.  Since I
don't use a land line, that was my whole phone book and a huge PITA.
I decided to avoid that hassle again I would get a Treo which I could
back up to PC.

When I activated the Treo (300) I was told I'd have to get a Vision
plan if I wanted to check email on the phone.   I argued that because
I had that service and functionality on my old phone included in my
plan I didn't feel I should be penalized just because I needed to
replace a broken phone by being charged more for the same service I
already had.  (I don't care about all the vision stuff, just email)
I spoke with someone who seemed to understand my point and offered to
give me a monthly credit in effect making Vision free.  I was careful
to be very explicit in the understanding that the deal was not just
the customary two month offer, but in fact part of my plan.  I hung up
satisfied.

A couple of months (December now) later I noticed I was getting
charged for vision with no sign of the promised credit.   When I
called retention I was told that no such offer existed and it was
erroneously offered and there was no way to honor that.  I tried
calling several times to speak with different reps but they all said
the same thing.  And of course they also said there was no record of
that offer having been made in the computer.  Finally I spoke with one
rep who seemed particularly sympathetic and willing to try to be
helpful.  He offered me more minutes, but I didn't need that, I
thought about what might be useful and asked him about a second line.
He said if I upped to a $50 1000 anytime min plan plus $10 vision he
could give me a second line and credit me back the $20/mo extra line
fee.  This seemed to be a fair deal so I agreed to that plan and a 2
Yr contract.   Because of my previous experience with "phantom" offers
I again made sure to be explicitly crystal clear with our agreement.
There was absolutely no mistake in our understanding.  He even told me
if there were any problems I could call sprint and provide his login
ID which he gave me and they could have him contact me himself.

So the first month bill shows up and there is no credit for the $20
add-a-phone fee.  I call and explain this to someone who says there is
no record of that aspect of the plan, but she would credit my account
$30 while she looked into it.  She also said she couldn't use the
login ID I gave her to contact that earlier rep even though that's
what he had told me to do.  At that point I paid my bill minus $30.

The next month bill arrives and still there is another new $20 charge
for the extra line and also no sign of the promised $30 credit!

I call again and am told there is no record of the $30 credit offer or
the free extra line, and again there's no way to use the login ID to
contact the earlier rep.  I ask to speak to the supervisor and am told
the same thing and that there is no such offer that exists anyway (for
the free extra line)  She offers me $30, I say instead of a $30 token
let's try to fix this.  She takes that to mean I have "declined" the
$30.  I finally say, look if there is no way that you can honor the
agreement which I agreed to then let me out of my contract.  She says
no, you will be charged $150 per line if you cancel; early.  I ask to
speak to her supervisor.  So then after going through the whole story
with this new manager, who is evidently "the" manager at that call
center,  she says she can't (won't) do anything because her computer
shows that I was getting everything I was supposed to be getting (even
though I repeatedly tell her the computer isn't showing everything
that was actually promised).  It doesn't matter that I had on three
previous occasions been clearly and explicitly offered these other
things, because they weren't in the computer they don't exist.   I
pled for even the slightest effort of recognition that Sprint has made
errors and in the interest of customer service should at least allow
me to get out of my contract, a contract which was agreed to based on
different terms than Sprint is honoring.  Answer, NO.   I ask if she
would then at the very least help me contact this initial rep who gave
me his login ID.  She says she has the capacity to do that but would
not because once an issue goes to a manager it doesn't get sent back
down to a rep.  After going in circles with her for an hour I finally
resigned to the fact that I was screwed, If I stayed in the agreement
it was going to cost me $240 more than I agreed to over two years, or
$300 to get out of a contract based on terms I hadn't agreed to.   So
I said, ok, since I'm obviously getting nothing else, I'll  take the
$30.  She then said that offer isn't good anymore, you already
declined it.  !!?!?!?!?   I was and am still absolutely stunned at
this level of response to what has been a series  of SPRINT errors!
It's unbelievable and absurd to the point of almost being funny.

The final chapter (for now) is I called back to try one more time to
get someone to put me in touch with that earlier rep, and the woman I
spoke with at retention this time said, I'm sorry there is a note in
your account from the last manager you spoke with to not make ANY more
offers of any kind to this customer, including that $30.

What possible recourse do I have?  Sprint has made ALL the mistakes
here and compounded them one after another, and yet they treat me as
though I am a problem customer now basically blacklisting my account.
But they have all the leverage?  What can I do? What would you do?