Booking.com lack of communication and takes to long to reply

Its now a month for my refund to be processed from Booking.com. they are taking very long to contact the hotel which i booked in and checked out within 15mins of seeing the room. They are very hard to contact and i already waited a full month for this to be resolved and to-date i am still waiting. They told me the hotel must make an exception for me but still nothing has happened. How long does 1 wait ?