SBCGLOBAL email missing with no access
I have had SBCGLOBAL.NET as an email for over 20 years. I know they were bought out and are now owned by Yahoo/ATT, but why is it that they took our access to our email away?? I have my log in and my password, I know them to be correct. Can anyone please help me access my email again so I can put it on my new phone and also my laptop. I have been on live chat help with Apple. I have been on live chat help with ATT. I have changed my password and tried to log into the new page on Google. It just keeps saying that my information is not correct, which it is, and then it locks me out after several tries. This should not be happening. I have important information in that email and I need access to it.
Thanks so much!!