@Korotoxa I’d recommend opening a support ticket on the Discord if you have not already Support tickets can be opened on the Official Discord channel # 
| create-a-ticket.
I can understand that this is a really unfortunate position for you to be in, but I don’t think it’s possible to arrive at the resolution you’re asking for.
It’s worth noting that community members have responded to your other posts with the same answer… If you do not have control of your wallet through private keys (your seed phrase) there is no way to prove ownership. With a non-custodial wallet you are solely responsible for your assets.
References to cross-posts: My Metamask Wallet seed phrase compromised and Still not eligible for the airdrop.