Remember that your signed message isn't valid now without the email.
He only removed the signature for security reason. Theymos have the original signed message so I guess that is still valid.
Anyway, why is you account hacked 'again'?
You should secure your account next time bro.
The fact is that most of my accounts have 2FA, which is really useful if you have been hacked. But you know, keylogging is always the best tool to do this. I simply don't remember where did I run a malware...