FNB missing funds

I would like to express my frustration towards the call center assistance i have received regarding a still pending matter. A payment was made to settle my credit facility with FNB, however nobody at FNB can trace the funds, even with the proof of payment which has been supp**** to them. I have spoken to so many agents (all friendly and helpful to a degree) but each one has passed me on to the next department and they cannot assist me. Then even at the department i end up in, they too cannot assist me and revert my call back to the previous department. I have left my details with 2 agents with the promise that a manager would call me....still waiting for that to happen. I have emailed the Mybranch department on instruction from an agent and had no joy, as well as the care@fnb, no response. Is there anyone at FNB that is able to assist me in finding the funds and allocating it to the correct account. I have been struggling since 27th March.