There's probably a "reward", however, it'll go in favor of the caller rather than the receiver. IF there is any kind of reward, that $100 will turn into $1000, even $10K in the caller's pocket. NOTHING's for free.
Saw the call was from Greenville, SC so I clicked talk and cancel. This is a business phone so I can't just let it ring to see if they leave a message. I wish all these scammers would leave me alone and stop wasting my time.