I called the number back and it is a recording. "hi, this is Julie. We called you because we have a gift card for you because you recenlty signed up with one of our affiliates...."
This is a total scam call. you call them back and they offer you stuff, that way they can say you called them. Pretty sneaky if you ask me. If you can, block the caller from being able to call your number. I work in an industry where our clients are being scammed by people posing as legitimate business trying to collect money and I can't tell you how many people fall for this and pay money.