I had been working in the Designs office for a quite long period as an "examiner"! After about 9 years of service I have left the Patent Office just few weeks back! As I am quite versed with the design procedures, I may suggest you something.
1. Is it a design cancellation filling at the patent office, kolkata? If yes, then beware of the assistant controller/deputy controller as they take bribes/favours to give a decision in your favour! If this is a cout case, then there is no worry at all.
2. Anyway, please prove in your petition that your design date is well ahead of the date of the defendant's design. If this is not the case, If you export your article well ahead of the design registration, you may be able to show the documents concerning the export of the said article. This will prove your novelty and originality issues.