Europcar took R3000 off my account illigally

My insurer arranged car hire on my behalf,i received the car from Europcar Centurion,upon receipt of the vehicle they requested a deposit of R1250, I paid via credit card. 10 days after they collected the car and after a week paid my deposit back as apparently I had adhered to their T's & C's, then 2 weeks later I received an sms that R3000 has been deducted from my account by Europcar, I ddnt receive any communication from them,no invoice, no explanation why they took my money-nothing not even a phone call, to make matters worse they don't even have my details on their system but somehow they can accurately use my credit card details I used as deposit to deduct the money, it's been 4 days and I'm still waiting for feedback from the branch and their invoicing department, such shocking and distasteful service received and complete disregard for the consumer, Terrible, be careful who you give your credit card details to, they can use that info anytime without your permission people be warned