Booking.com **** emails

I have used booking.com once, ages ago. I recently received an email telling me I now owe them a fee of R7543 for a cancelled booking. On checking their "View Message" or checking the booking.com link, it points to - https://i32he0w9dipn.ancillaycheese.com. Quite clearly not booking.com and a ****. My concern is that the only way the sender would have know my details is if some piece of @#£% at booking.com had sold it. I will NEVER use this bunch again!!!! What you, booking.com, don't realise is that eventually no one will trust you. Shove your website whete it fits