No response from Nedbank ***** Division

I am with Nedbank for many years and this is the first time I have to go this route. I had a nasty experience on the 15 April in that I have handed a fridge to somebody after I placed it on Marker place FB to sell and the person "paid" me accordingly and I have received the NORMAL Notice of Payment SMS from Nedbank I have compiled a comprehensive report as to what happened with all the proof and sent it by email to Nedbank ***** Division after my telephonic conversation with them on the 18 April. I have requested an acknowledge of receipt but no joy. On the 20 April I again sent an email requesting some feedback--still no joy. I phoned on the 25April and the lady I spoke to confirmed that she could see my original email and will get somebody to respond. Still no feedback from them. On the 30April I again sent an email stating that if I do not get a response, I will go the Hello Peter route