The rental company made me purchase another insurance without my permission, as the contract was in Dutch, and I initially thought it was a deposit. 200 euros feels like a rip-off. Contacted the rental service but they said since the contract was already signed, there was no way to get a refund. A reminder to other car renters: if you need full insurance for the car, it's best not to buy it from the rental app but directly from the rental counter. Otherwise, you might end up with two insurances. I've rented cars through the service 9 times, and 3-4 times I ended up with double insurance. The rental service should take some responsibility for this.