Consumer Redressal

Through an add campaign I was intimated by www.100bestbuy.com that I could enter into a competition where I could win an Iphone, and if I don\'t then would get credit points which could be used against purchases online. I never won the competiton and so the amount of Rs1998 was credited to my bestbuy account. Ever since then whenever I am trying to purchase a product against my credits I get a payment window open asking me to pay for the product. I tried calling BestBuy and the executives tell me that I need to read the terms and conditions and that they will ask another team to contact me for this, which has never happened till date ever since last 4 months. I am being duped by this company and I want my refund of Rs. 1998