ATM deposit issue

I have been facing issues when attempting to deposit cash into the FNB ATM machines 3 times this year. The first time around, I deposited R3 600 into the ATM earlier on the year but the ATM shut down and went out of service before the transaction could be completed, and so I took it up to the bank and I was reimbursed a mere R2 400 where the bank claimed that this was the only amount they had found in the ATM. A week ago I deposited R1 010 into an ATM and the same issue resurfaced. I was told to wait for 3-5 days and then I will be credited the amount, should it be found and I'm yet to receive any feedback. Last night I deposited R3 900, and to my shock, the machine swallowed the money yet again. Today, I asked to speak to the branch manager in hopes of getting some sort of explanation as to why this was occurring and I was brushed aside, where I was told that it could be because the cash I am depositing is low in quality, which is not the case. My business is suffering because the all this money that is being lost at these ATM's is vital in stocking and keeping the business going