Atm deposit failure

I went to deposit r2200 on the 5th November using fnb mall of the north atm to pay my rent. After I put the money into the machine a slip saying cash deposit was unsuccessful printed and the atm didn't give my money back so went inside the, was told to fill in a claim form and the matter will be sorted in a day or two. Explain to edwin that the money was for my rent and was urgent needless to say after follow ups with him and another visit to mall of the north branch the matter is still not solved. I got a letter of demand from my landlord cause the matter is not resolved. Got a call from the ops lady at the bank saying that they could not find any extra money at the atm. How is this possible that a bank could forceful ***** our hard earned money that we really need