Who I have the same questioned this topic

I signed up for a promotion buy one get one free.  Upon reviewing my account, I found I owed $119.96 on the devices.  I paid it off and the promotion was removed and now I still owe $119.96.  Spent almost 2 hrs on the phone with a rep and they could not resolve.  I asked to reverse the payment or move it to another line or just give me a credit for the balance.  Nothing could be done and they refused to transfer me to a supervisor.  I am moving back to Tmobile.