Cox providing selective internet. I cannot access Amazon.com, eBay.com and other basic sites. Can’t connect a fire tv because it connects to Amazon. No one at Cox can fix it. Where is this being blocked?

I cannot access Amazon.com, eBay.com and other basic sites. Can’t connect a fire tv because it connects to Amazon. No one at Cox can fix it. Where is this being blocked? Wiz.com, Poshmark.com…it’s a long list of blocked sites.  But I can get to google and you tube.  Oh I also can’t get to Cox.com!