Go to the Booking.com Help Center: https://www.booking.com/help
Sign in to your Booking.com account and open your booking to find contact options
Use the “Contact Customer Service” option in the app or website
Use the “Manage booking” page for reservation-specific support
Call the phone number shown in your booking confirmation or Help Center for your country
Use the messaging/chat option available in your account or booking details
Contact the property directly through your booking page if your issue is with the accommodation
Reach out through Booking.com’s social media support channels if needed