I have just learned how sleazy this company is. They are unscrupulous and unethical. If you have to cancel a booking shortly after you have made it (9 hours), due to your trip being canceled (visa issue), You obviously have to cancel the pick up of the vehicle as you have committed to picking it up as per the booking. My booking was done at about 8pm the evening for a booking the next day at 1pm in Johannesburg. Say an 18 hours window. My flight was canceled at about 2am the morning and I have responded on the website to cancel the booking. Now the shock! rentalcars.com charge you 20% for canceling and they argue you have agreed to it? The rental company (Avis, Europcar, Thrifty's, etc) can't keep a vehicle ready for you and you don't pick it up. The rentalcars.com website only offers one option: cancel with an excessive fee of 20%. You don't know this before using rentalcars.com. So how do you cancel but don't agree to the outrageous 20%? They add a statement to the cancellation that you accept their fee. Absolutely unscrupulous! But you don't accept it! but on the other side, you have cancel? They know it and abuse the situation.