If they are still control the old wallet, i think they have the obligation to help me return coins to me
because I have lost some of my coins in cryptopia fully because of their neglect of duty
help me to return coins back is not difficult thing.
They're under no obligation to refund you those coins. But it looks like they are still controlling the old wallets, and it would be very unethical on their part if that is the case. But I am afraid that you are left with few options.