Xfinity Advanced Security Blockin SMB’s Websites

Why are company’s like mind being blocked by Xfinity Advanced Security NEBuMAX.com ? I have seen many other complaints about this. I have several tech support tickets with no answer. Is this some kind of black list set up for big tech??? The website is secure and has no known security issues. Up to date SSL Certificate is in place. The regular Xfinity tech support has done nothing. Does Xfinity sub out this security service? How can SMB’s get solutions to this problem? Class action???