Hey Vinay
I didn't have great luck with getting ICICI bank to divulge this, but they can find out from the back end. I know of other people who have got this information from ICICI and HDFC, you probably need to speak with someone at the bank (do not go to phone customer care) and tell them to check their Finacle database or whatever banking database management software they use for the date when it was charged to the bank, not your account. Keep pressing on it and if 1 person cant answer this, ask him/her who can help you. Go to the branch manager if possible.
They can find out and tell you, they just may not want to do that.
Try telling them you want to open a fixed deposit for a few lakhs, ask them for a form and while filling it up, ask they guy for this info. Once you get it, you know what to do with the FD....LOL!!
Cheers!
B