*****ing from the poor

On the 16th of January 2019 I went to FNB Lenasia do deposit R2000.00 on the ATM While i was busy depositing the ATM went offline and the slip came out saying my deposit was unsuccessfull i waited on the Atm but nothing happened. I then went inside the bank and the who helped me told me that am the 2nd person who reported the same ATM with that particular problem that day and she made me sign some form and told me ill be contacted after 48 hours. 48 hours came and passed and after 5 days a refund of R1700.00 and the next day i went back to the branch and inquired why the R1700.00 and R2000.00 and told that's the amount they got at the ATM i told them it is R300.00 short i want my money back they called the bank manager who took my particulars and promised to come back to me as they are investigating its almost 3 weeks after i spoke to the branch manager but i still haven't heard anything from them.....I want my R300.00 back from there im closing my account with them.