Is this a DIRECTV phone scam?

I have been repeatedly getting a call from someone claiming to be from DirectTv, offering me free premium channels for three months.  They provide my basic information back to me, which is probably not too difficult to obtain, so it seems legit.  When I decline the offer, they hang up immediately.  This leads me to think it's a scam but customer service these days, for many companies, leaves much to be desired.  Scam or not?