I am a bit confused why have they accused you for multi-account when KYC is one of the best way to filter multi-accounts. I don't know this moneytoken so I can't have any comments with the project but the bounty manager (if it was him), should be open for explanations like this. I feel you are sincere and that you deserve what you have worked for.
I agree with him since KYC is used to verify those who are real from the fale ones. In my opinion maybe your private information is compromised and had been leaked and used for the KYC also. I think the best way to do it is to talk to the manager for explanation.