They give you a broken car - then you have to pay for it!

Oh, where to begin. My car went in for repairs which would have been for about two weeks. My insurance organised a hire car for me from Europcar Centurion. They gave me a Renault Clio the Monday morning right after I booked my car in at the repair center. I drove that Clio until the Sunday morning when it's spanner tool light went on and the car started making loud beeping sounds. I immediately checked in the booklet of the car what this means and it said that I must get the car to a repair shop ASAP. I took the car to Europcar Hatfield and told them I refuse to drive with this car any further. I was never advised what was wrong with the car and because I could not drive any further with the car, I did not get the opportunity to fill the tank. The then gave me a Suzuki Swift with which I had no problems, and returned the car the following Thursday morning as my car has been repaired. This was 24 January 2019. On 8 February 2019 I called Europcar Centurion to confirm why my deposit hasn't been paid back into my account, on then which Anke responded she will give me a call back to confirm because the system is slow - she never called back till this day. Only now on 21 February 2019 I receive the breakdown of what happened to the deposit. They deducted funds from my deposit to fill the tank for the Renault Clio - the car that I was not able to fill the tank of due to it giving serious problems for which I had to rush to Europcar before any further damage occurred. I am utterly disappointed and wish to receive my FULL deposit back as it was not my fault that they gave me a broken car to begin with!!!!!!!!!!! It's absolutely pathetic and Europcar must please be advised that I will never make use of them again, and advise everyone strongly against using them as well. They use any excuse and put the blame on you just to keep you from receiving your deposit money back. I honestly hope they read this and make a fast plan to refund my full R770.