<prompt> Human: Hi, rpersonalfinance,As the title states, I just received a 12,500 credit from T-Mobile. I went to check my bill and saw this amount on there. I called asking what this was, thinking it was some error displaying what I owed, but in fact the -12,500 displayed on my bill are credits as stated by two agents.Im not too sure what to do at this point as I havent made a payment for this large of an amount on my phone bill. I SHOULD owe my current bill this Friday, September 15th, but its currently telling me that I dont owe anything, or WILL owe anything for quite some time due to this.Any help would be appreciated as I have no clue how this happened.  <response>: Im willing to bet that this was a payment made by some corporation with a lot of cell phones for employees and account numbers got mixed up or something like that.If I was you I would make the normal payment you have to make and keep calling them until they figure it out. 