What do you have to do to get Comcast/xfinity to do anything correctly?

Huge billeg problems with our account that is definetly on COmcast end, and reps and supervisors just want to give the run around, and fix nothing.

How do we get Comcast to be accountable for their and their reepresenatatives [Edited: "Inappropriate Language"] that directly affect our account, check books, and lives.