Billing

We are going through a rough time now. I called T-Mobile and let the representative know that I didn't have the money to pay the bill and asked if it could be moved from Monday to Friday.  The representative agreed,  but I needed to pay half on Thursday and the other half on Friday.  That was fine,  so I agreed.  Monday comes and I have a declined charge from my bank to T-Mobile.  Thursday comes and the phone is cut off. I call again and explain my first conversation but I was told there is nothing they can do. Now I'm being charged ANOTHER $60 fee on top of my bill. I don't believe I'm being treated fairly because I had made a previous agreement with the first representative, I feel trapped with no way out, and no one to help.