Oh...my.

I'd definitely start with the bank. If you wrote a physical check for $110 and it went through the system as $2010, the bank should be able to see it and correct that pretty quickly.

If it was an online payment, etc., it may be harder, but if you're at your local bank talking to someone in person, they may be able to give you some direction.

This is one of those situations where I'd contact my local Fox/NBC/etc. troubleshooters and get them involved. They eat stuff like this up, andT-Mobile has had more than enough time to fix it.

You can also keep getting on the phone and escalating up the chain. Start asking for Mangers and Directors, not Supervisors. If you can get to a VP level, they'll pay attention (trust me, they do -- my boss just laid a couple of letters on my desk to deal with).

Please let us know how it works out for you.