Domino's Pizza — Complaint not resolved

Address:	Mumbai City, Maharashtra, 410210
Website:	Dominos.co.in

When ever i try to order from the app and use their coupons the app show that the nearby resturant is offline when there are 3 outlets near my place. So naturally i had to place an order through the phone and i couldnt use the coupon 'MOB10' in which i was entitled to get a free garlicbread worth 110 but the person on the phone said that it was applicable only for only orders and that there app is working fine and was very rude in that respect.
If the resturant was offline how was i able to place the order on the phone. Why give the coupons when you are gonna cheat the customers like this.
I even complained online but it has been 3 days and yet they didnt reach out.