Amount deposited could not be traced!

I made a deposit on a Nedbank ATM into my Nedbank cheque account - i then made a payment to one of my beneficiaries. The next day my account was on a negative balance not reflecting the deposit that was made. I had to contact the bank and was put on hold for almost an hour. This was a second occurance of such nature. I am not sure how to deal with Nedbank aymore!!!<br> <br> This was just an inconvience - how can my money dissappear from the bank!!!!