Trying to reach a customer service or retention center to resolve a billing issue.

Comcast customer service seems to be dead now.  There are no available chat nor phone call.

I tried to reach them through a phone many times, but it got disconnected after a long pause no matter what options I selected...

Currently, I am in the promotion deal with my xfinity interent, which will end on July 12th, 2020.  Although I prefer to stay with Xfinity, AT&T now offers me the fiber connection with 1,000 mbps for only $49.99.   I wonder whether comcast can match the price for my current service (300bps) so that I can stay with you since I am pretty satisfied with xfinity in overall..

Please let me know how to reach a customer service.  I'd like to talk with Xfinity at least before switching over to AT&T..