No Internet when it rains. Comcast refuses to send technician out

I have no internet when it rains. Out for 4 days last week then intermittent for 2 days. Internet out again for 4 days this week and again intermittent for 2 days. Finally got through to a HUMAN and appointment was set for this morning. Never called or showed up!!! Finding your customer service the worst I’ve ever encountered. What does it take to get a technician out to fix internet issue that is obviously outside of my house. I replaced the modem last week, that change did nothing to correct the issue. Getting very frustrated and my be forced to cancel Comcast; internet, phone and cable TV. 
I’ve been a customer for over 15 years and it seems like the don’t even care!