SPAM Reservations

Hi, I have the same problem like this http://easyreservations.org/forums/topic/spam-messages/.
Today, more than 30 incoming spam bookings.
In all forms of reservations included CAPTCHA.
Tell me, what could be the problem?
My website http://hiiumaarent.com/

So you’re already using the multiple reservations feature, but they still come through? Please post as many informations as you have like in the other thread.
Regards