Sir,
Notification No. 1/2011-CE dated 1.3.2011 as amended stipulates that no credit of such excise duty or additional duty of customs on inputs or service tax on input services has been taken by the manufacturer of such goods (and not the buyer of such goods), under the provisions of the CENVAT Credit Rules, 2004. Therefore when excisable goods cleared under the above Notification is returned for being re-made, refined, re-conditioned or for any other reason under rule 16 of Central Excise Rules, 2002 you can take the credit of duty paid on the returned goods. Under rule 16 the returned goods are treated as inputs. Therefore, when you return the excisable goods after being re-made, refined, re-conditioned etc., you have to pay duty afresh because no credit of such excise duty or additional duty of customs on inputs or service tax on input services has been taken by the manufacturer of such goods.