Here’s what consumers have asked with answers from Booking.com staff and previous consumers.
There is none. Nobody is supposed to call, just send your money and be happy.
Don't prepay for anything online without having a phone number and email address to the person, then check their reviews and do your homework before going into any business with them. If it looks almost too good to be true, you are probably going to find yourself with something stuck waaaay up your behind. If you read reviews about Booking.com online, you will find that they don't really give a sheet about you or your problems. They have no phone, address or email you can reach them on. Go ahead, try to get someone to talk to about your problems... Good luck.
No, don't be concerned. In fact, the other way around for me. I booked thru hotel directly for one night and the hotel screwed me over. Booking.com is the only 3rd party website I'll use to book accommodations. They get the best prices and give you the option to book and cancel without penalty in most cases. In fact, I booked one night thru the hotel directly and one thru Booking.com at the same hotel. The hotel overcharged me by trying to circumvent Booking.com. I prefer the guarantee of Booking.com and unless it's a reputable and international hotel chain, I won't go directly to the hotel on "trust" and "pay upon arrival". I was bait and switched on the night I did NOT go thru Booking.com - so Booking.com has earned my trust. Further, when I had an issue, Booking.com genuinely tried to resolve it for me with customer service agents who didn't write canned responses - but took the time to read and understand the issue. I will definitely use Booking.com again.
Contact your credit card company and file a dispute. They will credit your account immediately while they research the problem and wait for an answer from booking.com Be sure to upload any screenshots or photographs of receipts you may have when filing a complaint with your credit card company. Make sure you file your complaint within 30 days after you get your credit card statement.