Domino's Pizza — Unreasonable service tax on home delievery, late arrival, coupon problem

Address:	New Delhi, Delhi, 110062
Website:	pizzaonline.dominos.co.in/review/order

There is no service tax on home delivery which is implied on my order apart from it I didn't receive my order even after 65 minutes and still waiting for my order which is violating your 30 minutes delivery guarantee and store also promised for 45 minutes which was not provided.
coupon of 25% was promised as I applied code TMP25 but only 20% discount applied on my bill.
Please resolve my issue