Consumer Redressal

I bought a laptom from Great Eastern Dhakuria for Rs.30,000, including the installation cost. I paid the amount and waited for the installation process but they said there is some problem so come later. after that I went there several times but they did not help. they showed different excuses. I told them to return the fee but they said no. I also told them that I will take help from consumer forum but they said do what you want, we do not care.Being a middle-class person I feel helpless. please do something.