hsbc bank charging by conversion of savings account to power vantage with out written consent

sir
i have a smart money savings account with hsbc bank vile parle east branch.they are resorting to unfare trade practices.they with out my written consent converted my account to power vantage account which reqires me to maintain a mnimum balance.since my account was savings account for which a fixd deposit of 25000 is only required i have about 56ooo rs in it.how ever they with out my asking them in writing started deducting 742.70 paise per quarter as mimumum charge non maintenance of minimum balance of 75000 in my account from july 2007 till march 2009 which was noticed by me only then in march 2009..when i never asked them for this service hw can they convert my account like this .i wrote many mails to them they are giving me lot of excuses saying that for giving me bettr service they have done .when i know i need to have a mnimum balance of 75000 i never opted for this service in the past also i refused to be converted into power vantage.this is day light robbery .how can i get justice .pl advise me.thanks and regards sreekumar

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