ATT Email Account Hacked

I noticed I was not receiving emails on my AT&T email account, so I went to log in on a browser instead of through my phone and found that my password was not working, then realizing I had been hacked. I tried to reset my password, but the hacker already reset my security questions! Ugh! How can I get this resolved? Is their a customer service number to call for email support to verify my identity?