How to get to a live person at Comcast to resolve all issues!!!

Comcast/Xfinity has the worse customer service.  There chat line is automatic and doesn't answer questions.  They need a live 24/7 customer service line.  I have been trying to get online without any luck to correct information and review billing.  They have messed up our billing multiple times.  NOW, all I want to do is cancel my internet service and go to another better company with better prices and service.  HELP!!!!