Not Owning Up To Mistakes

I am really disappointed with the Nedbank help line service. Due to wrong and contradicting information given to me by Nedbank help line employees I lost R3600. The loss of this money could have been avoided if they knew what they were doing. When I contacted Nedbank with complaint they called me back and the lady asked for information and said it will be investigated. I received no call from her again. I decided to email Nedbank and got a reply from one of their employees handling complaints. I told him what happened and we sent a few emails back and fourth, each time denying that it is Nedbank who was wrong. He finally sent me an email to say that he investigated the matter and Nedbank is not at fault. I advised him to go listen to the recordings before telling me that the case has been investigated. I gave him the necessary info and then he never contacted me again. Each time I tell Nedbank to follow the correct procedures and listen to my recordings with the call centre staff the stop replying. Thus I have a problem with Nedbank for not wanting to own up to the mistakes of their empoyees and correcting their wrong doing. This has been going on since October 2015.