Sorry, it sounds like you got some bad information there. If Comcast sends a tech and the problem is on Comcast's end, there is no charge to you.
Start here: troubleshooting guide. If you still need help, please post a screenshot of your signal levels and your error/event log. Thank you!
Hello highfalutintodd, I am more than happy to assist you with clearing up your service issues. To better assist you please send me a private message with your full name, and account number by clicking on my name (ComcastAmir) and then "private message me".