found a glitch in www.bkdeliv...in via mobile browser
order 3 chicken whoopers at price of 1
add 2 chicken whoopers in cart.
goto checkout .
add coupon code NBK02.
now you will get one burger free.
here u change quantity of free burger using “+” .
you will see total 3 burgers now .
make online payment using paytm.
update : just recieved a confirmation from burger king for the order.
even they are confused , so order asap before it gets over
you can also try adding cheese or extra patty , got mine with extra cheese for the same price.