Why is my xfinity connection so poor

I pay for a gig of data and unless you are within 1 foot of the router you do not experience anything higher than 50 - 70mbs.  I have multiple pods that go off-line 3-4x/day.  I have had techs out here multiple times and they all do the same thing.  The issue resolves for about 1 week and then right back to the worst service. In this time of work from home, school from home...the amount I pay, this is unacceptable.  Xfinity is running a scam as far as i am concerned.