Unauthorized debit off my account

<p>After my car was booked in for repairs, the service garage hired me a car at their cost. As the car they wanted to supply me with wasn't available at fire, they booked me a different car and then upgraded as soon as the requested car was available. I was told that the only cost to me would be R1 500 fuel deposit which would be refunded once I returned the car. A week after the return, a further R1 138 was debited off my CHEQUE account without my permission, and I still hadn't received my fuel deposit refund. I was told that the extra amount (on top of the R1 500) was because of the upgrade fee. This was not meant to be charged to my account! I have since then received my original refund of what was left of the fuel deposit (after e-tolls and toll gates were deducted, understandably), however, I am still waiting for the R1 138 to be refunded a month later, after being told last week that the refund had been processed and they promised it would reflect in my account by this past Friday. I still have not received it!!! </p>