Extreme slow speeds following Network Enjancements

Around October/November we were notified that Comcast was performing "Enhancements" to the area, Ever since that first outage associated with tha outage we have had issues, slow  speed almost every night.  after MANY calls, New Equipment, A New Faster Plan, in December it seemed like they fixed it, that only lasted a few weeks.  Now starting the other week we have the same issues again, every evening it's almost useless.  when everyone wants to use it it's beyond slow, like 5Meg or less down (up is good) on a 2 gig plan.

  Please help, I’m getting nowhere with Comcast, and have spent Soooo many hours on the phone or texting them.

Also speeds are great in the morning, it’s when people are home and want to use it in the evening that it becomes useless.  I’ve read on forums it’s provisioning on Comcast’s end, but when I mention that it goes nowhere…