This is an unfortunate mistake that sadly neither Web3 Foundation nor anyone  can help you with. 

It is a bit like sending an envelope full of cash to the wrong address. Because we are in a decentralized system, only the person who owns the private key to that account can access those funds and send them back to you. 

If you happen to know the owner of the account, the only thing you can do is contact them and hope that they are honest!