FNB Just keeps *****ing me over. I am done

So I go in this morning to my nearest FNB ATM (Brackendowns) to deposit money. Machine takes my cash and tells me the deposit was unsuccessful. The cheek to have me now fill in forms to get my money back because FNB's ATM is useless has me incensed. Put a warning on the machine ffs. This is also not the first time this has happened according to staff. I needed that money urgently. FNB How can we ***** with you.