Costa Rica - Costa Rica Dental Implant

I had dental implants January 2008. I have been in pain ever since. I returned to Costa Rica have Dr. Garita fix this problem - but it did no good. (Still in pain). The dentist has not answered my emails. I thought he was honest and professional. He even told me that if there was a problem that he could take care of it. But now he won't answer my emails even the specialist that I'm working with in Texas wrote to him and doesn't answer him either. What can I do? To fix this problem is going to cost more money. Some of the implants have to be removed and etc. etc. $$$$ What I want to know is what I can do? Is there a dental board to complain to? Legal Action to take????
I feel I should worn others.