loss of sbcglobal.net email suddenly

My sbcglobal.net email was dropped suddenly without warning months ago. As a result I had to aquire a gmail address and  a currently.com address. I have tried to alert all my contacts and companies to my gmail account and currently.com but for a lot of them  it doesn't seem to register since they just keep going back to my sbcglobal account  info even though it doesn't exist anymore thanks to Att. I can't get my apple ID to accept either of those accounts and no matter what I do it won't accept any new password. 

I'm at my wits end! Can someone tell me what to do next? This week I tried to get into my Kohls account 3x and it wouldn't accept my info and we have had an account with them for 20 years. Finally I had to put my sbcglobal.net email address in and a password and it finally accepted it although that email doesn't exist any longer.  At least I got into my Kohls account for the first time in a long time. I'm at my wits end - can someone tell me what to do next? Kathy