Like most of us, saving some extra money is awesome, but please note that discounts are constantly changing, and so are the codes.
If you are experiencing this issue, then this is probably because:
1) Your discount code has expired.
2) Your discount code can only be used once (if used previously)
3) Discount codes can not be applied on items that are already discounted on our site or through a promotion.
If none of these is the case, then please contact us @ 1800-356-7478 and someone should help you with this issue shortly.