Complaint about FNB

I am beyond upset with FNB Middelburg. My son in law deposited money into my account via the atm on the 25th October. Whilst busy with the transaction the atm switched off during the transaction due to load shedding. He was told to fill in a form and they will get back to him. He has been to the bank and calling everyday consecutively to query about this deposit and gets told the same thing everyday, they are working on it, they either waiting for Head office or the branch manager to get back to them with feedback. On Saturday the 2 November he was told by the Ops Manager that they will escalate the matter and waiting for them to balance the ATM'S. It is now the 4th November 2019 and he got a sms saying that the money will reflect in my account today. This is totally unacceptable as i have bills to pay and cannot wait until they decide to balance their atms or attend to the query. Please assist!