But whatever you do, you must be based on facts. As long as all your approval procedures are in place, the house is built and the real estate license is issued, it is a legal building. Failure to apply for real estate license in time is illegal construction.
One suggestion is to unite the masses to file a lawsuit against the department that requires you to complete the formalities. The government's ruling mistakes should not be paid by the masses.
Another suggestion is a collective petition. As long as it is a collective petition, it is a group event. Now a harmonious society is being established. Group incidents are the most feared thing for governments at all levels.