FNB refuses to give back my money

I had deposited money June the 26 and as I had put in the money in the ATM the power when off because of load shedding. I live in PTA so I had to call the bank during the week and they were of no help at all. I then went directly to the FNB in Centurion and they said I need to go to Sandton as it was an ATM transfer issue. So I went to the Sandton FNB during the first weekend of July and I spoke to a lady there she had only taken down my details on a sticky note and said my money should be back in my account by the Wednesday. I then waited a whole month and during this month I had been calling FNB, sending in complaints to their customer service and they did not help me and keep directing my calls to their other branches such as Randburg FNB. I then went to the bank again in September I filled out a form with my details and spoke to Nwabisa and she gave me these contact details ***) if I had any problems later. She had called me saying that they did find that there was R300 extra in the ATM and they will deposit my money before the end of that week into the account I was trying to deposit into and I was okay with that. Since then I have not heard from her. Maria Banda