Booking.com review: Endless email loop, can't cancel reservation

I sent over six emails to cancel a reservation. I I was asked for the same information at least 4 times and each time I have provided it. I also explained that I never received the confirmation email to be able to cancel the reservation yet I am repeatedly told to cancel via the confirmation email. Do not do business with these people! They do not allow cancellations, no matter what they advertise!