ATM Swallows Cash Deposit

After Months of contemplating whether we should use the FNB ATM Cash deposit feature we finally decided to do it and it works except this time . I went on to go and pay my supplier as usual and the ATM toook my money and started counting ... It spit R100 rand out and said we must put in another all good and dandy and then all of a sudden YOUR CASH DEPOSIT WAS UNSUCCESSFUL With a slip . The cash deposit was obviously unsuccessful but the ATM did not return my cash deposit . What do i do now? their is not a single customer care number displayed anywhere on this ATM I hope that this matter will be resolved ASAP . Lucky for me i had internet access but what if i did not have .