Indira Gandhi National Open University — not getting original certificate from ignou university

Respected sir /madam
Myself sangeetha sekar did diploma course in food safety and quality management systems from a community college of ignou university in the year 2011. I got my mark sheet and provisional certificate from ignou university. But i haven't got my original certificate from ignou university. Contacting ignou regional center cochin since 2011. But no use. Now i got an opportunity to work in germany in food sector. So very argent to get my original certificate. Kindly tell me what should i do to get my original certificate.