Grovest Rencell dissappointing performance

Five years ago I invested in Grovest venture capital Rencell project. After five years, the value of the shares have not grown and declined. Currently there is no viable exit mechanism for shareholders. Rencell is slow to respond to queries. I await response to my query: Is there any reason why I have not received invitations to the previous shareholders meetings? Please can you advise what is the standard process for invitations to the shareholders meetings so that I can get on the invitation list for future meetings?