This is a long-running scam. You are asked to pay a fee or "tax" so you can get your "grant money". Called an advance fee scam. You did not get a grant or win a contest. Please be careful.
I got a call from this number too and spoke with Michael (Lee) Clark. He told me that I got a grant for answering a survey and asked me for my bank account number. I thought it was legitimate since I did take a survey for my college. I immediately backed away when they asked me to purchase iTunes cards amounting to $250.00. I also spoke with a Robert Young at (646)504-0791 and was asking me to purchase $500 worth of iTunes cards.