Aakash Tablet — non receipt of product/refund

Address:

Amritsar, Punjab

advance payment made to the company in june2012 for the aakash tablet and the company has promised the delivery of the aakash tablet in aug12. but till sep12 they postponed the delivery date. but after that they stopped responding to my emails. now i asked for the refund no reply from them. how i can get back my money? please any one help me