Did not answer. They gave up after 3 rings. Generic name "MED CLINIC" sounds like a scam.

trying to sell back pain relief devices

On No Call list apparently does not work

What exactly do you expect it to do? Block calls from scammers? That's your job. The DNC list is for legitimate telemarketers; scanners could care less about it. Invest in a call blocker.

Do Not Call is ONLY for repeat offenders when the agency sees a huge pattern of abuse. It is not a system that can prevent telemarketers from using a robocaller; only you can do that. Best advice is what Tygerkat said: get a call blocker. If it's time anyway to buy a new phone, make sure your selection includes call blocking because most of them. Mine can block up to 250 calls. And I just blocked this number, next time it is used, the line will be dropped immediately.