Worst Service Ever - Intermittent Dropouts - 1 GHZ service only 500mbs -3 months continuous contact

I have been reaching out to Xfinity for 3 months to get my intermittent dropouts fixed.  They send a tech who checks to make sure my connections are tight and that is it.  Still happening been calling been chatting and rarely connect with a person.  Level 2 service callbacks have been promised multiple times with NEVER a callback.  I upgrade to Gig dL speed because of my working from home and my daughter attending remote schooling and I am only able to get 500 mbs download.  I have the latest xb7 gateway, did away with my wireless router as they said that had to be the issue.  Still the same.  NO ONE WILL HELP!!!