Poor customer service and failure to refund deposits without reason

I rented a vehicle through Europcar whilst my own car was being repaired. Was charged R460 for a accident waiver which i did not want. There was also no indication on the contract that I had certainly elected the cover. I complained about this more than 2 weeks ago and i still have had no feedback. I then had to rent another car because mine was not yet finished. I had to pay another R1250 deposit fee . I only drove the vehicle for 2 days. It is now more than 3 weeks later and i am still awaiting my refund in respect of the deposit. I have not even received an invoice as yet. Now that I see all of these terrible ratings... I am not surprised by their poor service