Nedbank ***** and Refund complaint

On the 6th of April 2019 an amount of R6700 was taken out off my account and I got no notification on my phone. My card was with me. I reported the case at Nedbank Mall of Africa and I was advised that they will conduct an investigation because they could not trace where the money was withdrawn and that will take 30 days before they can refund me. 12th of May I went there again and got no feedback nor refund, I spoke with the manager until today I have not been assisted. I want my money then I will leave them in peace.