I have been dealing with a billing issue and now I have a charges over $700 and whenever I call customer service everybody everybody washes their hand and keeps referring me to another department. They assure me that I will be getting that credit and they give me confirmation numbers and asked me to

I was going to cancel service and the loyalty department promised me a specific price for Fiber Internet. This was two months ago, every month I have to call spending at least 1 hour on the phone to get a price adjustment for the promised price.  How do I get ATT to fix this so my bill is consistent