Samsung B7722 Keys are not working

My samsung phone GT B7722 , Touch screen fully working. Hard key not working Except ON/OFF Key.Call Attend,Back, Volume Up/Down, Sim Change,Lock Key Not working. Kindly Clarify me the step to resolve the issue.

samsung : Please provide fix for this.1000 of people suffering wasted 12000 rupees. we need a fix

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