Incompetence and dishonesty

I had a loan car from Europcar in April/May. The car was sideswiped by another driver on the 30th April on the front right side while stationery. On returning the vehicle, I had to fill-up the tank and give them a statement with the case reference. I was told that I would have to pay an excess until all was settled by the other driver and my money will be refunded. I received an invoice with the amount and I had to pay the difference as they held back my deposit. I paid outstanding amount on the 19th of May. I kept getting phone calls and sms's harassing me for payment until July and each time I resent my POP as well as emails stating that they are a nuisance. I am now unemployed and received a phone call in November which now they say I've been handed over because payment is outstanding. I gave the lady all the details once again. By now I should have received a refund and not only that but on returning the vehicle with a full tank was charged a fuel levy. My opinion is that this company is not only *********** but disgustingly dishonest and their staff have no people s****s and a very bad attitude and it should be made public knowledge.