We are paying for 1200 mbps but consistently receiving less than 100mbps- starting to think this is a scam and nobody knows anything!

Going in circles with Xfinity techs.  Running speed test through 4 sites (Speedtest.net, google, sonic, xfinity) and all site are always less than 100 mbps.  Called support and ran several tests- restarted gateway, rebooted, unplugged.  Nothing worked.  They scheduled tech visit for few days later. 

Tech came out, ran tests too and saw same results on 2 laptops and 2 cell phones. Also ran on his own cell.   All devices are fairly new.  

The modem I was on was xfinitys modem.  Tech changed it out despite stating that the newest modem he would be giving us is not superior to the one I had.  The newest models had more issues reported.  He still installed and ran new speed test.  Still at times only reaching <10 mbps.  

Tech pushed new firmware and said that "tap" outside was corroded.  They were going to have new techs come fix.  
Ran several more speed test and nothing changed. 

Then tech came to fix box ("tap") outside and said it was fixed.  Speed test still did not change. 
Called support back and went over it AGAIN and was instructed to reboot, re start gateway -all that 2 more times.  

Nothing changed.  Speed still <100 mbps.   They scheduled appt to schedule ANOTHER tech to come tomorrow. 

Xfinity called back and said that they fixed everything now and to test.  I tested and Nothing changed.  No speed changes on test from multiple devices. 

The rep could not tell me what the "fixed"  but only said she restarted the modem.  Then she told me to just wait for the tech to come out again and that she guarantees it will be fixed tomorrow.  

THIS IS ABSOLUTELY RIDICULOUS AND DISSAPPOINTING.  I WFH AND CAN NOT HAVE THIS CONSISTANT LATENCY OR DEAL WITH SEVERAL CALLS TO RISE AND REPEAT THE TECH TROUBLESHOOTING SCRIPT.  After several years of disappointing xfinity service, its about time I listen to the rest of the world and ditch them.  And not one person can pause or credit my bill ($300 mo). 

Taking suggestions for better service.  Did you drop Xfinity and get better service?  If so where?