RDK-03036 - have internet - no cable

Hello, I have been trying to resolve an issue for over one month. 

First - we had no access to cable and had error messages on both boxes. Finally we had a technician come out and replace the X1 Box - but we were unable to check on the second box. When I did, the second box said RDK-03036. I called and arranged a call back. Probably tried 5 times for this route over several weeks. I know that they are busy, but at this point, I have already arranged for a technician and spent hours dialing and arranging call backs - I am paying good money and spending time on a service that I should have.   I usually defend Xfinity due to their reliable internet - but this is totally unacceptable.  I was told I would get a credit for the days without service - NOPE - who do you even complain to.  I know they don't need me as a customer - I just didn't realize how much they would scam me when I actually needed help.   They keep telling me its loose wires, not the box - they will not send a technician during Covid19 - but if it turns out to be the box when all this clears up- they won't charge me for the visit. 1. Please help.  2. Are there better providors in the State of Washington.

1. I don't want to be charged for the box until that visit. 2. I would like a technical person to answer - how come i can get netflix and prime on that TV - transmitted via cable - but not TV - it sure seems to me that the wires are tight enough.