Open dates blocked by Booking.com without any authority, nor permission by me!!!!!!!! My calendar is conjstantly blocked by booking.com without my authority to do so!!!!!!!

Phone Support team as per below options to review the real root cause before making assumptions.

Reminder you cannot post actions requests or any action request on here.

Message or Call BdC PartnerSupport ***

1. In the extranet, go to the ‘Inbox’ tab.
2. Select ‘Booking.com messages’.
3. Right Pane - Click on ‘See Contact Options’. 
4. Choose Account
5. Now choose Other
6. Then at bottom , See all contact options, and click Message or Call
7. As there is no one number for all partners, the number for your nearest BdC Partner Support is then revealed.

*** public main lines via Where you can reach us