Think it yourself. They have the wallets, all transactions are onchain and no multiple person deposited from the same address. Anyone trying to exploit repayments would need access to your address to take your funds if deposits was sent back where they came from.
If they have access the deposit wallet ID and if you have the access of the wallet id from where you have deposited the fund then it will be easy to verify even it doesn't require verify as they will just refund to the address from where they have received the fund.
But according to the post of the op wallets have been deleted. So, if wallets have been deleted then how to verify to which wallet the payment has been received and from whom??