Useless service

I have a timeshare week that I put into their rental pool. In their mail, they say " It is the responsibility of the owner to follow up on the status of their rental unit". My week starts in the first week of January. I sent an email on 8 December, 9 December, and again on Wednesday 14 December. No response. They just have no concept of etiquette. Useless service by their reservations people.