I had a big problem with the company Usave in Montenegro.
In the beginning, they did not accept the full insurance I bought via Rentalcovers, and I had to pay €200 for their own insurance.
Later, they charged me €481.58 for a tire replacement without telling me, even if it was agreed they would pay.
I told Rentalcovers, and in two days I got all my money back to my bank account.
Good and reliable service!