SafariNow and Thesens Island:Two Tides

Please help. I booked in Septemeber for our Holiday in November. I received confirmation from the establishment. I have paid 3/4 of the booking fee. This week I get a message from the establishment (Thesens Island:Two Tides) saying: "I can't accept this booking". No explanation. I enquired more and "They said I must cancel with safarinow directly". I have sent an email and now waiting but this is just poor service. I could have looked for different places in time if you cancel 1 month or 2 months before but to cancel so heartlessly 2 weeks before my holiday is just terrible.