The worst car hire experience I have ever had!

Awful. I was really quite shocked by the service at Goldcar Malaga Airport. Firstly we could not find the pick up location it is not sign posted. After an hour of trying to find it in the terminal and asking we eventually found the car lot where the cars were and Goldcar staff but only tobe told the main counter was back in the terminal and we had to go there. We explained we had already been looking for an hour could they not help us and they said no. While this was happening 3 other couples approached with the same problem so clearly a signage problem and not just us. Once we did find the main counter I waited nearly another hour to be served. The staff member I spoke with was rude and aggressive. Honestly shocking manner and tone. Then her informing me of all these additional charges I wasn't aware of - no clear explanation of these charges either. She demanded I buy the additional insurance even when I told her I did not need it as I had my own. She told me it would be unlikely I would get my 1400 euro deposit back unless I took the insurance. I told her that was basically a threat to spend more money and that wasn't ok and I wouldn't purchase it. She then told me I had to or she wouldn't give me the car. Then she told me I had to pay about 90 euro for the fuel because the tank was full and they had filled it for me and then there was another 27 euro refilling service fee when I returned it. I explained that this has never been the case when hiring a car. It is always full when you pick up and you bring it back full. I said at best I would pay the 90 euro for the full tank even though this is above the average cost for a tank and I would refill it myself to save the 27 euro. She told me I could not do this as it was in the terms and conditions and that if I did not pay both these fees she would not give me the car. But I have now also just received by email a bill for 38 euros charge to refill the tank. What is going on here???? I feel lied to and extorted.