Think you need to know that Turkey is not like the U.K. The people in Hotels and restaurants work 7 days per week usually 12-16 hours a day in the season. So they take a break from November until April. Why should anyone be there to answer the phone?? They will answer, probably in April and you will get booked, so don't worry, chill out like the Turks do. Seems like some staff are already back and getting the place ready.
If this is the place you want to stay, be patience, you will get your booking.