1. The said Co-Operative Society is not right in refusing to register your name as the member in place of your uncle, being his nominee,
2. In fact the share certificate issued in faour of your uncle by the Society needs to be changed and your name should be added in place of his name,
3. You have not mentioned as to why the said name transfer has not been affected by the Society or the Registrar,
4. At thgis stage issue a legal notice demanding issue of fresh share certificate in your name and register your name as member with in 15 days,
5. You are expected to get reply from them to decide your course of action.