After I had booked and paid for a car rental on goldcar website, I went to the office to pick up the car. I had to pay for a deposit for the gas (as you'd expect). They did not refund the full amount (although I made sure to fill the tank before handing the car back). After investigation and few emails with their support center, it turned out, they charged me for an "Premium" insurance without telling me. The price was 10x what I initially paid. The person at the counter did not tell me anything about it at the time of the car pickup. Avoid... scammers.