Money just "missing" after being paid into an FNB account.

I opened a business account (I have an existing personal account) about a month ago at woodlands branch. The lady was very helpful, and as soon as the account was created, she gave me the number to deposit R500. The tellers were busy, so I used my card at the autoteller. Sure enough, the business account showed, and I deposited R500. However, back at the desk, the lady said it had been paid into an incorrect, old account that no longer existed. 45mins from her side trying to make use of the absolutely useless helpdesk phone-in system, she promised to follow up. Two weeks later, I went there to collect my new card, and she asked if I had been contacted. No, and she promised to follow up again. It is now more than a month, and still no word on my R500????