Xfinity Assistant is Awful!!! Why Can't I Speak With a Live Agent?!?!?

Worst customer service experience of my life.  There are other options just as fast that don't cost $80+ dollars a month.  This is absurd.  How can I get in touch with a real human being?  Here is my question... I just paid my VERY high bill. If I switch providers now, when does my internet shut off, and how will I be charged?  Am I charged by until next month, and will my internet stay on to give me time to switch providers, or will it be canceled immediately and how will I be charged in that case?