Still no refund!!!!

I hired a car and the booking was very efficient, so I was impressed. However when I returned the car, nothing. Still waiting for my deposit to be refunded, when i queried this on Monday I was told that they had a problem with my card to refund and was sitting with my deposit, this was a week ago. If I hadn't called who would've called me? So then I get told to please resubmit my card details which i did, still no luck and not even a call back to confirm when it will be done or even if they have received my email. To further add, a full tanks of petrol is deducted, which I wasn't told at the time of the pickup but is in fine print on the agreement. They were very quick to tell me all the other details but this one. And I had refuelled the tank before returning the vehicle.