Pizza Hut India — Refusing to give cashback for mvisa trasaction as stated in the website

Address:	Pune, Maharashtra, 411001
Website:	www.pizzahut.co.in/mvisa-offer.php

I ordered pizza on 16/09/2016:
Order no[protected] and delivered. As per pizza hut website, payment made via mvisa will be given 25% cashback upto max rs. 200. So i paid via mvisa using hdfc payzap.
I then inquired after week about my cashback to the email id provided in the pizzahut website for the dispute. They said no cashback for your transaction and contact the pizza hut.
Pizza hut has not grievance redressal system, only way to communicate via feedback.