There are only two photo shops that I would deal with – Adorama and B&H Photo. They are real and very respectable companies.
The scenario you describe is standard operating procedure for the shady NY electronic store. When I was new to it all (1996 or so) I got lightly burned but it all worked out.
You need the Nikon lens, that is a classic bait and switch. Sigma makes some good lenses, but I assure you that you want the Nikon kit – this guy lured you in with a Nikon “kit” but swapped out all the pieces but the camera body for cheap crap.
Box everything up, send it back with delivery confirmation and dispute with your credit card company. DO NOT PAY off that balance, if you do you forfeit the right to dispute.
Then buy what you want and deserve at Amazon, the two companies above, or — quite frankly — a local big box store.
