Blanca was the coordinator there, but she left a few weeks ago. She's been replaced by a new woman, Antilino or something similar. Tania (who you mentioned in another thread) was the coordinator eight months ago (she was replaced by Blanca).
I wouldn't worry too much about not getting a quick response because they're probably in a stage of transition. Even when I was signed on and emailing questions over, it wouldn't be unusual to have to wait 1.5 - 2 weeks for a response (someone told me they answer emails in order of wedding date -- so the girls getting married right away that need answers right away get serviced first). If you're in a total rush, you could always have your travel agent call them directly... that works for me!
Best of luck. Let me know if you have any questions, I might be able to help (29 days until I'm there and counting!!)