corporate contact

I have had an ongoing issue with Xfinity that has been unresolved for far to long.  I Have been texting back and forth with store manager and she ceased to answer me.   I do not want the direct message option as that has never resolved a single issue.  I need to be directed to customer relations at a corporate level.  I do not want an email to one of the people that answer the forums.   I want direct management.