<prompt> Human: I had T-Mobile service for a single day - turns out it was pretty awful in my area and I was getting dropped calls and really poor service, so I immediately went and switched to ATT and ported my number to ATT the very next day, effectively canceling my account with T-Mobile and I did call to confirm that the account was canceled with them that same day I switched to ATT. I had just purchased an iPhone 6 directly from Apple, contract free, so no subsidies on the phone.I got a first bill in the mail for them for an entire month of service, so I called and complained to them and explained how I only had the service for a single day and the charge was completely excessive. They agreed and changed the bill to 6.19 for that single day of service, which I happily agreed to pay. I had taken down the ID number and name of the representative who did this for me though I only have initials that she gave me over the phone.Lo and behold a month later I got another bill, charges increased, saying I was overdue. I called in once more, unhappily explaining the situation, and another rep said theyd fix it.I got billed AGAIN a third time, this time from T-Mobiles collection agency. I called them right after I spoke a third time to T-Mobile, to a third rep who said she was going to fix the collections issue and get that to stop, and the guy at the collection agency said he had no record of my account number or my phone number in his system, like my account didnt exist. He also had no record that I spoke to anyone on the phone at T-Mobile.I just got another bill in the mail today where the charges were yet increased, and oh no, theyve suspended my service which doesnt exist through them, and Im SURE this is going to be sent to an actual collections agency any time in the next few days. Im beyond frustrated and pissed at T-Mobile, and despite their numerous promises about the issue being fixed and that theyre showing me at a 0 balance, I continue to get billed, like the finance department cant communicate with the rest of the company.What legal recourse do I have here? How do I get this to stop? Im pretty confident T-Mobile is not going to fix my problem, and is only going to continue billing me, so I need some sort of way to get the billing reported as fraudulent and get them to stop.Help?  <response>: Before filing complaints, try sending a detailed email including dates, account numbers, phone numbers, your contact number and other important info about your situation to their customer relations department at: 