VPN prevents internet access

I have completed multiple remove/reinstall cycles etc. without success. The Norton works fine on at our Xfinity location but not on Optimum. Norton  effectively  has no  functional customer service which is the reason for appealing to whatever this group is. I am a decades long Kaspersky customer who recently left for obvious reasons. Kaspersky was flawless. Unfortunately my next stop is the FTC. We deserve a product which matches Norton's representations upon which we based our purchase decisions. 

Thank you