Beyond frustrated

Our neighborhood had upgrades recently to 4G. Ever since the upgrades we have constant lost service and buffering. We went to the store and they gave us a new modem as we had been using our own and it said that it could not handle the speed. We are still having constant buffering and dropped service. We have seen more Xfinity technicians at our neighbor's houses then we can count. When I troubleshoot via the app they tell me that my service has degraded and a technician must come to the home and there will be a charge for this. This is obviously a problem that they have caused on their end. With this upgrade. I swear they give s***** equipment on purpose so that they can charge you to come to your home. We actually had one of their techs tell us this years ago.