Absolutely the worst Customer Service of any Company I have ever dealt with

I cancelled my Direct TV account the end of July 2020 because I was moving on August 1st. I was told I needed to return my equipment and I would receive and email telling me how to do this. Never received any information and after a couple of calls lasting a total of an hour was told to drop my equipment off at a Fed Ex office which I did. Then I got a $95.26 bill for service after it was cancelled. After a couple more calls with extremely long waits and difficulty understanding the foreign accents was told that I had a credit of $64.83 for turning in my equipment. So I paid $30.43 on 8/25/20 which should have indicated my account was paid in full after applying the $64.83 credit. However I received a bill saying I owed $95.26 with no credit indicated. After spending ONE AND A HALF HOURS waiting for a Customer Service Supervisor yesterday 8/31 I was told that I still owed $64.83 balance and they were not able to just simply apply the credit to my account showing that it was now paid in full. Instead they said they could only send me a check for that amount (to my old address where I no longer live) and then I'd have to send that amount back to Direct TV in order to show that it is paid in full. In the meantime I was charged a late fee and threatened that it would go to a collection agency affecting my credit. This is totally unacceptable and unbelievable that they can't just apply the credit to my account and show that it's paid in full. Direct TV has by far the absolute WORST CUSTOMER SERVICE OF ANY COMPANY I HAVE EVER HAD TO DEAL WITH