If you have written agreement with the partner why not, you can take the partner to any level you know you can get justice to solve the challenges, but if there is no written agreement between you and the partner, there is no way the matter will be solve easily. The home country base of the partner can handle such case,  if you have genuine evidence like the written agreement, picture of the partner, signature of the partner and other details of the partner but if you fail to provide the necessary things about the partner, it will be difficult for them to solve the challenge in a way it will favour you. I think, social media has made many things easy to humanity these days,  you can search for the partner social media handle where his or her family members can see your complain or the company he or she represent can see your complain and they will definitely find solution to it.