Bad Service from FNB after deposit malfunction at ATM

I have a HUGE unresolved problem with FNB. I made a cash deposit at one of their ATM's on Saturday, for whatever reason the ATM malfunctioned and did not credit my deposit, nor did it return my money (R3000). I immediately reported it to FNB and provided all the information on what time and which ATM it was as well as the account the deposit was intended for. I was advised that once the ATM was emptied it would automatically reflect the failed deposit and show the additional funds. My account would then be credited. We all know ATMS get emptied every 24-48hrs. It's now 3 days later and still no money has been transferred to me! This is urgent yet FNB don't seem to care.