Domino's Pizza — I paid and ordered for pizza on 14th june. didn't get it ever.

Address:

Botanical Garden Metro Station - Dominos, Gautam Buddh Nagar, Uttar Pradesh, 201301

I paid for the online order and ordered 1 pizza along with some sides on 14th june at around 8 pm.
Till 9 pm it showed, "out for delivery" and at 9:40 it got changed to "delivered"
However, i never received any pizza or the sides.
I have been chasing the guestcare email id since then only to receive nothing worthy in reply from them.

What to do now?
Should i stoop down to their level and cause losses to them? There are various innovative ways to do that.