You can reset two-factor authentication in the Google Authenticator app.
Current ways are described on the Google support website. (for example if you have backup of the 2FA codes)
If you are unable to reset two-factor authentication through the Google Authenticator app, you need request reset via Exbitron support only.
To do this, you need to contact Exbitron support, via ticket system, click Submit a ticket in the right upper corner (In Requester, fill your email address and in Subject enter 2FA reset).