All the bankers, I have spoken to seem to have no idea what an ARN number is!!!??

I have been to different branches of FNB and also on the phone with consultants. I need to track a payment that has not been received and the merchant has given me ARN codes, for the bank to trace the funds. Everyone is just puzzled at the banks on what ARN code is...can someone connect me to the right people inside the bank :(

ARN explained: Acquirer reference number,(ARN), is a unique number that tags a credit card transaction when it goes from the merchants bank (the acquiring bank) through the card scheme to the cardholder's bank (the issuer). This number can be used by issuing banks to trace a transaction with an acquirer.

Please help, not everyone can be clueless about this...Well I hope not.

Regards, Ipeleng