Reliance Trends — Coupons not provided although mentioned in invoice

Address:

Binaka Mall, Jagdalpur, Chattisgarh

I made purchase from Relaince Trends, Binaka Mall, Jagdalpur, Chattisgarh todate after seeing the ad "50% off + shop for 3499 & get additional 25% off. Also get coupon worth 4000 on shopping worth 3499 or more"

I made purchase over 3500 and availed 25% additional discount. However when I asked for coupons, the people at counter said coupons are not available and that they are helpless.

On enquiry if such coupons can be made available on soft copy, they said that the same is not feasible.

Once I reached home and checked bill, I found that 1 coupon alongwith it's No is mentioned in the invoice.

How do I proceed with my complaint?

Thanks