1. If your shop is constructed o the basis of a valid sanctioned building plan and on a lawful plot of land there is no question of demolition.
2. So to know the status of your ship you can send a RTI letter to DDA calling for necessary information.
3. Once you receive such information you can decide on future course of action.
4. Do note that before demolition the occupier or owner of the structure is given with a proper notice and once you get such notice you can challenge the same in the high court as per merit of the case.
So consult an advocate once you are served with any demolition notice.