Scam for "free gas vouchers".

It was a telemarketer... "We'll email you 100 dollars in gas vouchers.  You only have to try one of two family saving services for ...."  I cut her off yelling "NO NO NO" into the phone.  
They called my CELL PHONE and wasted minutes that I was paying for.  I was royally pissed that they wasted my time AND money.