Problem solved by creating a new account & contacting them.

Support NovaExchange
Jun 11 (2 days ago)

Hi,

We can turn off 2FA for your account, but for our users account safety, you will have to validate your account first.
When checking your account, you have one deposit on it, please send us the 3) TXID on that transaction to your Novaexchange account, when we have validated your transactions, we will turn 2FA off for you.

That we require any kind of validation to remove 2FA is for our users account safety.

Regards
Novaexchange Support Team