Dropped for the opening two one-day internationals of New Zealand's upcoming series against Bangladesh, Munro responded in defiant fashion to help the hosts post a commanding 212 for four wickets after the hosts were asked to bat first.
The Black Caps ended India's run of 10 Twenty20 worldwide series without a defeat.
Kuldeep Yadav eventually made the breakthrough, removing Seifert, but Munro continued on and reached his ninth T20I fifty before Kuldeep struck again. With bowling figures of 3-0-27-2, Daryl Mitchell was the pick of the Kiwi bowlers.
Shikhar Dhawan fell early in the India reply but Rohit Sharma (38) and, in particular, Vijay Shankar (43) kept the tourists up with the required rate.
Having said that, it was a 63-run unbeaten partnership for the seventh wicket between Dinesh Karthik (33) and Krunal Pandya (26) which saw India stay alive in the game till the last three balls of the match.
Seifert, the hero in the series opener, bludgeoned 84 off just 43 deliveries - his innings laced with seven boundaries and six hits over the fence to lead New Zealand to a record 80-run win.
A wide and Karthik six off the final ball brought the final score closer but by then India's hopes were gone.