Consumer Redressal

I have purchased Micromax P580 Funbook on 5th April 2014, Invoice No.48153 from Micromax e store. But till date they have neither dispatched the Tablet nor refunding the money. When contacted over phone they are telling we can send only when the stock comes and cannot refund the money. In the estore they mentioned it is readily available. They are lying the customers. Worst ever service. Please help me either to get the tablet immediately or get my money back. When contacted over email, they are giving an irrelevant reply and not either sending the tablet nor refunding the money. Please help