Unhappy capitec client

Two weeks ago I received a transaction sms from capitec which I bank with. The transaction was unauthorized and I immediately reported the matter. The amount was R800. According to them it is an online trading purchase of which I confirmed I don't purchase anything online nor do I do trading. They then told me they will take the matter up for investigation. I got feedback last week Friday. The feedback was fruitless and not enough information. Basically they gave me information that I saw on the sms. And then went on to advice me to open a case. I was not happy. As a banker I feel I'm not protected and besides blocking the ****s what is it that the bank does? Please assist me I'm heartbroken R800 is alot of money for someone who is making ends meet.