Poor communication

I received an email stating that I had an unclaimed benefit. After numerous emails I eventually called them and was left waiting for half an hour before my call was answered. The consultant was very helpful and polite. He reviewed my account and we discussed two benefits that were paid out to me last year. He then noticed two other benefits that he said were also paid out to me in 2011 and 2013...into an FNB account. I was living abroad at the time and FNB could also not trace any account that I had at that time, I don't remember having an FNB account at the time either. I've now been sending emails every day since Monday asking for the proof of payments to that account. I have received no reply. I also sent messages from their website but again, no response. I've been trying to call them but I simply can't hold on a call for 30 minutes plus, having to listen to how high their call volumes are, while I'm at work. I really hope this review will get a response.... to whom were my benefits paid out to? It certainly wasn't me!