Flight to Cologne was cancelled and my car booking too even though Rentalcars had my flight details. Rentalcars say that if you are more than two hours late picking up your car, they will cancel your booking and refuse a refund. I had a chat with their call center and asked for a transcript but never received one. They also charged for insurance which they did not provide as I did not get a car.
Do not trust this company, they fraudsters at best. My booking reference *******
I am taking this up as a dispute with my Credit Card company.
My advice, deal directly with the car rental companies.