Billing rates and refunds

I have spoken to numerous Comcast customer service reps and can never get a consistent answer.

I have asked several times for a written copy of my agreement and they say they will provide it, but never do so. They promise me my rate will include taxes and fees and then later tell me the rates do not include taxes and fees. The difference is not a few dollars here and there, but anywhere from ten dollars to fifty dollars a month!