couldnt key in bank swift code

This makes zero sense  ,as the sender would be entering your IBAN / Acc & SWIFT/BIC Code.

you can also use an online validator. but i still dont see why you would be entering the guests bank info when you are receiving.

maybe write out full succinct detailed paragraph, instead.

validate my BIC - Bing

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Simply report to BdC Partner Support , see below 3 methods.

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.

8.  

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

    

    

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