No return call!!!!

My name is Tina, I called on March 8th to have my mobile phone disconnected.I was told it was turned off..I also told the person that I was talking to that I did not want anyone going in to my bank account for any payments..I was being charged for a phone that I do not use..I only have it in case of a emergency. Well yesterday I seen that they took money out of my account! I called and was told that my phone was still activated.I tried to explain that I had called on March 8th and was told that the service was turned off..So once again I was told that the phone was being turned off again..I asked to speak to a supervisor, after being on hold for a long time I was told that he could not find a supervisor, I asked for a call back, I was told that I would get a call back from the supervisor. Well the call never came!!! I was livid  when I asked for the phone to be disconnected it wasn't, and the fact to me that Xfinity mobile stole money from me, after I told them on March 8th that I was not authorizing anyone to go into my account!!! I will not pay for a phone that was not being used!! I use my other phone.. When a customer asks for something to be done, your employees should do it!!