any way out if the period of show cause notice expires but y

In a case, the client did not reply to a show cause notice issued by the service tax department for payment of service tax dated 1/1/2008, received by him on 1/4/2008 till date. The notice requires him to pay tax which otherwise is not payable by him, because of period of limitation of 1 year(which can be proved that there was no malahide intention) and vide finance ministry circular exempting builders selling flats. show cause notice gave time to of 30 days to repky barring which case will be settled without fruther notice. niw since 30 days from the date of receipt has passed, is there any way out for him?