Unauthorised purchases on my Bank Account

So, I've seen unauthorised online transactions happening on my account to the value of +- R700, all done on one day! The only thing Nicole in the Shoprite Park Capitec branch is telling me; " we'll have to give you a new card and that way the transactions will automatically stop, because you'll have a new card number". Wow if I had to be an older or even stupid person I just had to accept this ****, we'll I'm not! I had to insist that she log a request to have this matter escalated to get my money back! I am not willing to wait 14-30 days for Capitec to resolve this matter ! I need this sorted A S.A.P or I'll have to report this to the OMBUDSMAN after 3 business days.