Netbank makes payments disappear on the internet

A payment of R5,000.00 was made into my account on 8 Aug 2015. This payment was made from one Nedbank account to my Nedbank cheque but never reflected in my account. I eventually got a hold of the person who made this payment and he insisted that the payment was made into my account. He even sent me the proof of payment. On 18 Nov I went to the branch to show them the proof of payment and they logged a call for me with the ***. I have been calling the Internet Banking department with no joy. I have been told that this case has been escalated and that I cannot get feedback. All I want is my money. How can Nedbank say they make things happen when a simple R5,000.00 cannot even be traced. I'm very frustrated and extremely angry because this has been going on for too long. Can this payment be traced and credited into my account!!!!!