No customer service

Hi all, I have been a capitec customer for a few years now and have recently had a very bad experience with them. Last week I made a cash deposit at the Reef mall capitec ATM, the problem I'm facing is that there is a different of what I deposited and there amount. The worst think about this is that I have been calling the call center from last week and all the call center can say it is been looked into, but I have Not had the Investigator contact me or email me. I'VE HAD NOT CORRESPONDENCE FROM ANYONE THAT CAN SAY THEY ARE DOING ANYTHING.. WHAT IS MY WAY FORWARD WITH THIS MATTER?