Cognizant Technology Solutions — Food plus card expired after leaving company. now not sure who to ask for balance amount.

I left the CTS organizations last year, after that i forgot about the food card and the balance amount in that. When card was about to expire, I got reminder, but by the time I check my e-mail on that card was expired. When I called HDFC bank people asking about my balance, they told contact prepaid section. Then I e-mailed details to pre-paid cards. they told to contact your CTS. In Cognizant whom to contact? I got some HR number called up... they are like I am not the right person. so what to do.. where my money goes.