atm cash deposit not counting money correctly

I have did a cash deposit of R20 000 at the absa atm in Phoenix plaza. The bank only accepted R15940 and there was R20 000 in notes of R10 R20 R50 R100

they have short credited my account of R4060.00. I have been to the bank to lodge a query on 08/10/2018. I was told IBV will investigate and contact me in 3 days. Its now gone 10 days with no feedback. Does absa like to rob the client of R4060

Whos going to pay debit orders that goes off unpaid. If the atm is faulty something should be done about it.