How do I to claim the Indian consulate for delay in issuing visa which ended in loss of around $800 along with the stress?

I applied for Indian visa through Travisa on 6/6/2013 as I had my tickets booked for 6/20/2013. They told me to surrender my Indian passport. I did and my visa was expected in 4 days but I didn't. The online status said the visa arrived at Travisa. When I called them they say the visa was wrongly attested with someone else picture so they send it back. Now my flight is in 2 days and my visa didn't arrive. I have to change my dates which costs me $700 for changing dates plus difference in the fare. I had lot of stress and my brother’s wedding was arranged depending on my ticket and because of their mistake I am in trouble. What can be done?