How to Cancel My Account

I have tried to contact ATT to cancel my ATT DirecTV for three days to cancel my account. The local ATT store tried to contact ATT with no luck. Apparently ATT Customer Service said to heck with Direc/tv customers nor Corporate Store Mgr's and went on vacation. My local store manager did place my request in our ATT Account so there is a record that my equipment is deactivated and disassembled. So how do I get my DirecTV account cancelled if ATT will not even answer the phone. I can't even find a way to email ATT.