The Secretary shall stay, suspend or revoke any permit issued under these rules if it is satisfied that the permit was issued by mistake or that a patent error has crept in it or that the permit was happened to be issued on misrepresentation of fact or law or that the construction if carried on will be a threat to life or property: Provided that before revoking permit, the owner of the permit shall be given 7 days notice, and an opportunity of being heard to explain and the explanation shall be duly considered by the Secretary.