Recover Hacked Gmail Account Support

I'm seeking assistance to recover my hacked Gmail account. I am unable to log in, and all account recovery options, including recovery email, phone number, and security questions, have failed. I have also tried contacting Google support without success... (Budget: $30 - $250 CAD, Jobs: Account Management, Computer Security, Data Protection, DNS, Microsoft Exchange, Technical Support, Troubleshooting, Web Security)