Who called from 8607484461

This number keeps calling me in the morning and when i say hello they hang up...this has been going on for the past 2wkd

They keep calling and when I answer the phone they hang up. What the hell is going on here?!

Call and hang up on answer

don't reply it is a scam they say you won a "free" $100 gift card to walmart. They also claim they work for walmart. they said they would need a credit card to verafy the something. but anyways i called walmart and said it was a scam. so dont answer.