Total Disregard of Customer

I booked a car hire with Europa Car on the 7th of July and returned the car on the 8th of July. I left the car at they parking bays as it was on a Sunday. Monday morning I was informed that the car had a minor cosmetic scratch which they need to send the car for repair. To my understanding cosmetic damages are covered under the Super Waiver option which I had selected. Its been three weeks now and the car is back on the road but my deposit has not been returned. I am told that I must wait for 21 days to receive an invoice to which the car has been fixed within two days.