Constant disruptions to internet and cable for several months

We have been having problems with both internet and cable for the last several months. Download speeds have been highly variable with internet frequently dropping out entirely. Multiple cable channels are pixelated, particularly the HD channels. We have done all of troubleshooting steps and this has not helped. We had a technician visit and he confirmed our equipment was working. He told us the issue is Comcast has been doing upgrades on the infrastructure around us. We'd like to know how long this will take as it has been dragging on for a LONG time.