Worst Customer Service experience ever!

I joined Xfinity in 2020 and had great service but the customer service has gone from poor to worst service ever! They increased my service plan from $39/month to $59/month. I called to find a better deal and was offered $40/month for another year.  Then thy ask me for my phone IMEI to activate a new phone line. When inquired, the promotion comes with a new line which I asked to skip and not activate. Then agent tells me the plan is only for new line as a discount. I sit and step up a new phone on my end. As we are finishing the order, asks me for a credit card information. After inquiring there is an additional $25 one time charge. I agree to pay it and complete the information. Now, after sending 1 hr on the call itself - the agent hangs up and a new agent comes on. He asks me how can he help me? I am frustrated as he does not know anything and wants me to repat. I asked him to review the case as been working for over 60 minutes. He reviews and wants to help with my billing issue. I ask for a supervisor. He again put me on hold and returns to tell me no supervisor is available and will request a call back. I get called within a minute, not an a supervisor but another agent. Same routine continues with the next 3 call backs. Finally, 4th agent calling me back tells me she is report the compliant and wants to help resolve my issue. 

This is a nightmare and possibly the worst customer service ever. Xfinity does not provide a way to provide feedback, report a complaint or reach a supervisor. They have monopoly in the region and do not care about customer experience and only revenue to sell on ever increasing plan.