[Resolved]  Snapdeal.com — False assurance of relief on price on using promo code

I am interested in bying a used 2 anna bull coin as shown in this e-commerce site. The company is sending message to my mobile phone several times to use promo code like sdfun and get relief of rs 400. But while applying this promo code, they are giving relief of only rs 70. This is cheating. Why are you luring a customer with false promise? Remember they have never said the said relie[censored]pto rs 400. It is a definite figure of rs 400. I want proper redressal of this issue and relief of rs 400 on the shown price of rs 709.