I need a manager - My bill has changed - and customer service representatives keep lying

Hello, 

Long time Xfinity customer - My bill recently jumped from ~50$ per month to $110. When I called they said my bill would go back to the original amount. 

I paid the wrong rate for one month, and I see the wrong rate again for a second month. Once again I call, and once again, a customer service agent says

that my bill would go down. They tell me to make a payment for $40, and by the end of the billing cycle, my bill would reflect my payment as well as a refund for

the month that I paid the wrong amount. 

Now - for the third month, the bill is over $180 - which includes the balance from the month where the customer service agent TOLD me to pay $40.

In summary, I've called 3 times - been lied to all 3 times with no resolution. It takes about an hour to do this every time - so wasted time on top of that.

Xfinity is truly the worst company I've ever used. 

I got an email from a customer service person asking me why I gave a low service rating - once I explained my situation, no further response. 

I hope I get some help here.