Reembolsos

I was trying to set up payment arrangement instead I ended up adding my bank account and sending all my money to T-Mobile. I talked to  a representative and I explain to them that I was trying to set up a payment arrangement and if possible can they give me back my money. The representative said they could send my money back 3 to 5 business days it's past 3 to 5 business days and they still haven't sent me back my money, so why did they tell you that if they're not gonna return your money to you