Unauthorized online purchase on my account account

My card was used for an online purchase by someone for Mr D that I don't know, whilst my card was with me in the car, I received a notification in the evening , I was in the kitchen cooking dinner. I immediately block my card, and visited my closest Capitec Bank first thing the next morning on the 02.10.2020 . I was first told to pay the I was given a reference number that this would be resolved within 14 days. I have been following this up. on the 29.10.2020 I received a call from a private number the person said she's from Capitec Head office who told me to pay R70 in order for them to conduct investigation, I told her no I am not paying them a cent for them to investigate they still owe me my money for the purchase I have no idea , what's difficult to call Mr D to find out where was the food delivered and who signed for it then go to that address to sort this out. Yesterday I went to the bank a month to be exact and I am being told that I still need to pay R70 that might be refunded after 46 working days should their investigation proved that I am not the one who did the online purchase. Why must I pay again and yet someone used my money ordering food while my money I trusted with the bank and I feel I am victimized double , someone ****s my account nd the bank has a nerve to ask me to pay in order for them to conduct investigation, this is PATHETIC!! To be asked to pay for the bank to conduct an investigation on the ***** that took place on my account. All I WANT CAPITEC TO PAY ME MY MONEY. This is not fair that I buy grocery and cooking after a long day at work, but the bank expects to promote crime and yet I am the victim here...