Myntra.com — goodwill coupon is not applicable to anything in the cart

Address: 520015

I am trying to apply a goodwill coupon i recieved from myntra to the product i added in my cart but after applying a message displays saying"your cart has no appilcable product for this coupon" this coupon is nearing expiry. Many a times i talked to myntra customer care executive they told me that this coupon will be applicable to "shopping offer 16"catalogue. I tried applying the coupon to items under catalog "shopping offer 16" but the same message saying"your cart has no applicable product for this coupon" is displayed. One of the executive told me to uninstall the app install again and then apply the coupon to the product coming under catalogue"shopping offer 16" i did this too but coupon is not applicable still. I think the coupon is just a spam