How to change the primary member ID email?

I recently sold my business. The new owner called AT&T and took over my account however, he received a new account number. When I logo onto ATT.com it shows my canceled account, my Direct TV account and his account for internet and phone service at work and it also has my email as his primary member ID. He did not take over my email. I've called about this and att said he would have to call to remove it. My question is why would his account be on my page? I should be able to remove it. I'm not sure if he has access to my email? Please help me to resolve this issue!