Money not refunded

On the 2nd of May 2023 my son mistakable deposited money into a business approved account apon realising this I immediately alerted the bank via telephone then I was advised to go to the bank.

On the 3rd of May I went to the bank and the consultant who assisted me was told that if she can get the full account no of the business the relationship manager can authoriser to transfer to my account.

Since that date have made several trips and sent emails the last positive response was that they fount the client and waiting for them to authorise.

Last week went back to the bank and the client said they have multiple companies under that account so they want to verify if it was indeed an error. Mind you I don't know this business.

I suggested that they take my ID number and search if am their client or not.

Please assist me who can I contact? Because what I know if I find money that does not belong to me I must not use it as the bank will deduct when the rightful owner reports.