Rental agent "lost" deposit.

Agent from Nest claims we paid our deposit (equal to two months' rental) into the wrong account. Paperwork clearly shows we paid into the account provided. The agent spent this money, and refuses to update our monthly rental invoice to reflect the deposit and interest. By law this is ******** (RHA 50 of 1999). Keeps making promises to "fix it" or "sort it out" since we have started demanding our deposit to show on the monthly invoices since Aug 2024. The principal agent for Nest says he cannot help as this agent is a freelancer. Nice loophole to get around the PPRA.