I hung up on them immediately the first time, then I got called back every hour. After literally 9 calls I answered again.

Very heavy Indian accent. She said her name was Carol. Claimed to be in pheonix even though it was a California area code. Suppesedly I was to get a 200 gift card that is good anywhere my credit card is. She asked what type of card I had, I lied and said Mastercard. Then she said I need to verify your identity, can you confirm 5 is the first number in your credit card number (Almost all mastercards begin with 5 so the victim will think they are legitmate and already know the credit card number). I lied again and said yes. Then she asked for the rest of the numbers, after that I hung up.

Somehow she new my name and mailing address (I assume some company sold that information to this company)

I found that this number was used by a scam company called Gold Coast last year, Gold Coast fit the same MO, heavy Indian accent and they promised a 300 gas card instead of a general gift card. I assume they changed their name in the last few months