Worst servcie received

On the 6th of January 2018 we picked up a car from the Woodford car hire rental that we secured via the online service subsequently made the required payments. The car that was furnished was not the same car we booked i.e. Kia Sport age instead of Hyundai Tuscan. They never even apologized for the mishap. We booked the car for 5 days and on the 11th Jan 2018 we returned the car. We were advised that the windscreen had a small chip and we agreed as we had to rush for the plane and given our insurance experience no access is even required for such. In addition this damage is even not expensive to fix. My credit card was debited without my consultation R 8 000 and R 4 000 on a different days and when we asked we were told that it was for the windscreen replacement. We are not going to lay this to rest as we feel that this is a day light robbery. I agree that we signed for damage acceptance and it was clearly stated that it was a windscreen chip. How on earth does a windscreen chip result to a windscreen replacement.