Thanks a lot for your suggestion. Yes, I also feel the same. Can you please give me few names of data recovery specialists? Also give me rough idea about the price. I'll be thank full to you for that.
Need to find something in your area, I'm guessing you're not in the US based on your username.
Prices can get high depending on what needs to get done, would be a few hundred dollars to start with and can head up from there.
Where I work we spent about over $4,500 recovering data from 2 500gig drives, but that was mechanical failure. Your disk wipe could be more expensive, they'd have to read the old magnetic signature of the files, if anything remains on the disk after the wipe, bit by bit.