Non REsponse from Absa credit card division

I was overseas in December 2018 and went to a jewellery shop in Jerusalem. I purchased items for +- R13500. On my return to the hotel I checked my account and found that a transaction of R6500 had gone through without my authority. I immediately phoned the ***** department, and as soon as I got back to SA I continued to follow up this loss. I have written +- 12 emails with the words "We are looking into the matter"It is now August and I still have not been able to bring this ***** case to a head, and the bank has not had the courtesy of ever getting back to me. I have had 3 case numbers, and still no action. Where do I go from here. Many Thanks Lyn Cohen