Cable Problems

I live in Canonsburg PA.  Several weeks ago, Xfinity told us they "upgraded" their cable/internet service for our area.  Since then, we have had nothing but problems with our TV reception.  Mainly the problem is pixilated pictures on all channels.  I have given up using their chat bot and call customer service to find a solution.  Totally frustrating!  I am paying too much to tolerate this problem for much longer.  Any suggestions?