Try logging on at a library/friends house/ anywhere with free wifi to see if it's anything wrong with your account.
If it works fine, I have no idea since you already tried all the other possible solutions..
You could try VPN
(Sorry guys I'm no computer genius )
I just logged in at someone else's house and my account worked fine! But sure enough, once I returned home and connected to my home network, it wouldn't let me connect again.
Why can't my IP connect to Classic? It's quite annoying.
I don't believe I did. I wanted to each time I made a ticket, but I just... didn't. I'll do this now though.
They are probably checking the last IP the account was accessed on, and since you're using a proxy that IP wouldn't be banned. So I'd recommend resubmitting a ticket with your IP Address.
I sent in two tickets and they were never replied to and now they say "ticket not found" when I click on the email link. So, I think they deleted my tickets.
I don't understand why my IP was banned and why they won't tell me anything.