Refund needed

On Tuesday 28/01/2020 I attempted to made a deposit using at FNB atm (Zevenwacht). The atm provided me with the error "your deposit was unsuccessful" however did not return my monies. I visited the Zevenwacht FNB the Wednesday (29/01/2020) to get my refund. I filled out the paper work and stated the amount due to me. The next day I got an SMS about a refund but with the incorrect amount. This amount was about 15% less than the monies taken from me. I then visited the store again the Thursday (30/01/2020) informing them about the problem. The branch said it will be investigated again. During this time I was refunded the INCORRECT amount. I then visited the branch AGAIN on Sunday (02/02/2020) where I was informed its escalated to the ops manager Jared, and he is to call me. Today is Tuesday (04/02/2020) and yet no response from FNB. I need the remaining monies owed to me to be refunded. REF *** Q