phone scam

I'm new to xfinity, had my service turned on about a week ago. About an hour ago, I received a phone call from someone claiming to be from xfinity. The person started talking about how we discussed the rate for my plan about 10 months ago and how it would be changing in a year, ... The call caught me off guard and without thinking I said, "I'm new to xfinity, I only started my service last week." The person then said something like, "Oh, you're not Mr. Samuels? There must be a mistake here."

I realize now that this must have been some kind of phising attack but it's pretty disconcerting. How in the world did they get my information so quickly and then choose to contact me? I've never had anything like this happen in the past, let alone one week after I sign up for new service. I'm starting to wonder how safe I am being a xfinity customer.