Philippa: If you do a search with the key words Sosua and synagogue I am sure you will find a long thread on this from some time ago....there are names and numbers. They do not have services every Sabbath but generally speaking there are people there...
This was on closed threads, good luck.....
Calle Dr. AlejoMartinez and Calle Dr. Rosen, El Batey
1-809-571-1386 or 809-535-6042 or 809 -440- 9981 Yvonne Milz
Religious Director--Oisike Ghitis