Why do booking.com keep booking 2 different guests in the rooms at the same time and charging me when I need to cancel?

I only have 3 rooms and have checked all these details but booking.com are somehow booking in separate guests into the same room overlapping dates or arriving at the same time.  If I cancel one I am told I am charged and responsible for finding other accommodation.   This is impossible as Cornwall is jammed with guests now and it's impossible.   I have no contact numbers to contact booking.com and despite them telling me they have tried to email and call I receive nothing. 

It us not fair that I am charged for this nor that I am left to deal with irate guests.  I am spending a my precious time is currently don't have in speaking to guests and phoning around trying to find alternative rooms

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Julie - Commun… 2 years ago

Hi Lisa - thanks for posting in the partner Community. Given this complex situation, please call us. To find a dedicated phone number to call, log in to the Extranet, click Inbox, then Booking.com messages. You will see the correct phone number for you to call listed. We don’t publish these phone numbers here because we only offer this service to current partners. I hope you find a fast resolution! Thank you for partnership with Booking.com.