Unacceptable conduct

I just deposited money at an fnb atm, Loch Logan Mall in Bloemfontein 22 Dec 2019. The machine just cancelled my transaction in the middle of the transaction as it was counting notes. Then it sent a reciept stating my transaction is cancelled. It says comp code : T550 and has no trace code. When I call the customer care number it doesn't go through. I mean this is not right. Why have a number that is not attended when you are closed for business? How are to express grievances like this? This is unacceptable really. If the banks are closed then the call centres must operate.