Car Parking - Hyderabad

Hi, We live on 4th floor of an apartment in Hyderabad. Building has G+2 permission and later we have applied for BRS(building regularization scheme) under regularization plan as per Telangana government. We have the car parking in our registered documents and a slot allotted by the society initially and have been parking our car in the same area for 3 years. Suddenly one of the flat members is harassing us that he looked at the development plan and as our flat has no permission we are not entitled to have a parking space. Kindly suggest the appropriate action that I can take against the member. I have already conducted meeting with all the flat members and have shown them the registered car parking in the documents. The only member is questioning my parking and not paying the monthly maintenance fees to the association. the member is taking the names of Police and an advocate to threaten me. Please note that no one had issues with my space. Here I am unable to live with peace. My respect was offended and kindly let me know what cases may I file against the member. Please let me know whether I was wrong to have a car parking with registered documents and a slot already allotted.