I'm a citizen of Sri Lanka. I visited India on a tourist visa in 2007. I didn't overstay and didn't have any issues when coming back. But when I applied for a visa in 2012 for business a visit I was granted the visa but was deported at Chennai airport, being told my passport was blacklisted. They couldn't give me any explanation except to say the Indian government doesn't give me permission to enter their country.
Now I need to travel in a week for a business visit.
How do I get my passport removed from the blacklist?
Even if I get the visa without removal from the list, I'm concerned that they may deport me once again.