contacting booking.com

I am trying to get hold of Booking.com as my card was cloned and someone has booked a hotel using my card on their website. I cant give them any details of the booking (as requested in the email required when contacting them) because I don't know what has been booked. I also didn't get an OTP for when the booking was made. Money just went off my account. How do I get a hold of someone from booking.com that can help...