Airtel — Data Coupon

Address:

Bharti Airtel Limited – Enterprise (Corporate), 6th Floor, Interface Building No-7, New Link Road, Malad, West Mumbai-400064, Maharashtra

Unable to redeemed data Coupon, even I have an active prepaid plan, it shows coupon couldn't be applied, I have an active data prepaid plan of 699 in which I got 4 GB free data Coupon when I try to redeem it shows couldn't be applied, I have raised a issue but it couldn't get resolved yet, I tried contacting customer care again no response or resolution from their end