Candidate joins company on start date but company again delay joining and HR not responding to queries

I have joined a company on 23rd March and also marked my attendance on the very first day, later I see company has postponed my joining to 25th May. When I ask HR about my joining status I get no response from him? Basically HR is not responding to me hence I am doubtful that I will still be unable to join on 25th May. What can I do in this case when I have showed up myself on the very first day on joining and company then deferred my joining to later day and also not responding to my queries?

I do not know what your query is or how you expect an outsider to resolve it for you.
However my personal suggestion is to find a different job and forget about this one.