If I have time I have fun. I develop software and frequently have time on my hands while the system is running a compile. If "John" happens to call, fairly frequently, I listen and press 1. Then I leave the talker on the speaker until they finish. Then I spin a yarn. Tonight after we discussed the system and its features, I told him I thought it was a great idea. He took down my address, etc. all made up.
Then I told him I lived in a nursing home, had for years. He'd have to call the director of the home to get payment authorization. He asked me for a credit card, then a checking account number, I told him I didn't need any of those as the home took care of all my bills.
I must have kept the poor [***] on the phone for close to 30 minutes, thinking he made a sale. The I thanked him, told him to make arrangements for payment with the director, and said "Gotta go now, bye!"
If everybody, or even a few, did this every chance they get, these guys would probably give up. Anyway, at least you get a laugh. The more of their time we can waste the better it is for everyone.
It is a Scammer calling from a hidden location and spoofing the caller IDs. What are you expecting the Do Not Call list to do for you? Monitor your incoming calls day and night along with the over 500+ million other telephones in America, screening your calls as well as the over 1 billion 500 million+ calls received in the world each and every day? The Do Not Call List is just "A LIST" It is only a list with your number on it that is maintained by the FTC and purchased by legitimately Registered with the FTC Telemarketing companies, within the USA. It has no mechanical ability or personel to do anything other than provide the numbers of people to businesses who request to purchase them. Those companies who purchase them are required to register with the FTC. It is the honor system of which only the honest businesses do in fact honor the "List".
The scammers could care less and will never abide. The DNC is just a list of people. It does it's job and what it was designed and intended to do.