They Call, then Hang Up so you call them back to see who it is. Once you do that you can not add them to the "Do Not Call Registry" because YOU called THEM. It's a new scam way of Calling so they can't get put on the List.
This is a scam! They call and hang up to entice you to call back. Then a recording prompts you that you have made a qualifying purchase today and have won a$100 rebate voucher to use at home depot or some other retail store. Then.... Press "1" to redeem your voucher.... Press "2" to be put on the DNC LIST. THEN if you press 1 it connects you to an "agent" who is very rude and will not really answer the question when you ask what company they work for.... Then proceeded to tell me that it's only $4.95 for the shipping.... "What address do you want us to send the voucher to? "...,lmao, are you kidding me!?!?