I've been trying to access my Havelock account all fall. It also is giving me a 2fa error. The thing is, Authy and GAuthenticator moved all my codes over from my previous phone, and there isn't a Havelock key on it. Their support seems to have copy/pasted various messages to me without actually reading(or responding) to my requests. Primarily the please sign a message with the private key you used to deposit on Havelock!!!
It's been 4 years now or something like that. I don't have whatever wallet I was using. I just want to pull my 3BTC out. I'm starting to wonder if they're breaking accounts on purpose or something. I hope not...
I know your pain... Pretty much the exact same thing happened to me.
Keep emailing them, keep responding to their questions as best you can, keep making noise and you will get access to the account and your money back! Well I did anyway, but it was painful...