Did you set your account with 2fa enabled?
If it's 2fa enabled it's impossible that someone can access your account unless if they have secret copy of your 2fa keys or possible someone has remotely access to your laptop or PC where your 2fa software installed.
If you haven't set the 2fa in your gatehub account hacker can be easily access your account that is why they are always remind you about the 2fa.
I had 2FA enabled and It's been untouched since 2017 If you google the address you'll see I'm not the only one hacked.
Oh. maybe there's an issue in their side.
Honestly, I don't trust to save any coins in an online wallet which is not well known I tried searching about this site and most of the users are having different issues about gatehub.
I don't know if you can recover them but try to scan your whole PC and report them to their support and tell them that everything is safe and ask about 2fa how hackers could access your wallet without two-factor authentication?
Because it's impossible to access the account without 2fa digit pin.