Stole my money but don't refund within the promised timeframes

I have returned the Hyundai Grand i10 that I have tended for a month and return day was the 17/04/2016 and the car was returned on a full tank. I have also paid a deposit of R1200 upfront that was supposed to be refunded to me within 7 working days after returning the vehicle..to my surprise just when I was expecting a refund my account was debited an amount of R1040 without any communication to me, I acknowledge the use of their e tag but it was not even over R500.00. Mind you I am still expecting my R1200.00 and my R500 that wrongfully deducted from my account..you keep on trying harder but it doesn't even show because you're acting like capitalists.