MISSING PAYMENT / ARN NUMBER USED

Ihave been to the branch and have spoken with more than 10 of FNB agents , in different departments. So many times I have been to customer services and complaints department. No help received up to this point. I need someone to track a payment for me, that I have not received to date, it was made by a company abroad, and they gave me an ARN number . Can someone there connect me to the right people/ department. Am so frustrated , its been more that two weeks now , FNB is NOT helping me at all. instead they refer me back to the company that made the payment , and I have the same response all the time from the company. Seemingly this ARN number, customers have been complaining about it more that 2 years back. still noone knows what ARN number is