XFINITY LIVE AGENTS

It seems  like everyone you speak to is located overseas and either doesn't understand you or does understand you but lies. I have a somewhat lengthy ongoing issue that seems to be getting worse, instead of better.  How  do I get my complaint to the right people.  Is it even possible?  I am on the verge of cancelling my internet and mobile accounts because of the lack of customer service.  This is above annoying, it's outright ridiculous!!!!