The car rental company didn't clearly explain that their insurance and the insurance I bought on the rental platform are separate and would cost extra.

I already bought insurance on the platform, but the store made me buy it again when I signed the paperwork. It was unavoidable.

They set consumer traps and deceive customers!

Do not use this company. At pickup, they claimed I didn't have insurance (even though I had bought insurance through the rental platform) and forced me to buy additional insurance for around 10 euros per day. I strongly refused, she still insisted and then claimed my credit card limit was insufficient (they wanted to reserve 3000 euros, and my card had over 4000 euros available at that time). I had to buy the insurance to reduce the required credit limit. Finally, I thought I'll only visit Belgrade once, so I bought the insurance... In the end, they charged me over 1500 RMB for some unspecified additional fees during the 6-day rental. Avoid this company at all costs!!

It was okay. When asked, confirmed not to get insurance, but it was on the paper.