Sony Ericsson C510 — there is no cybershot..

I had bought a mobile sony ericsson c510..i went there to buy another mobile but they braiwashed me and get me into c510 that there is 3.2mp and cybershot so i fond of it and bought.and i checked later and found it is not really cybershot.and asked that dealer,and he says that it is not our mistake do what you can..so by this i'm subjected to mental stress and loss of money by buying andloss of money for arguing..