The problem with returning the call is that the number that appears on caller id could very well be spoofed and you could be calling somebody that has no connection to the operation. Spoofing is a common practice of these bogus calls. In the past they would display out of service numbers. But now they will display any number.
Even if the number that appears on caller id is connected to a bogus operation, returning the call confirms your number and could lead to more calls.
Well this number called here earlier. It appears to connected to another one of those medical alert scams. The difference with this call is that the name of an actual person appeared with the number.
I will not disclose the name since there is a reasonable that the number was spoofed and could belong to an innocent party.
That is a myth. The FTC does not provide a list of the numbers that are are on the do not call registry. These operations tend to use software that dials numbers at random. If anything they get phone numbers from companies that provide basic information. I believe one of the biggest culprits is the AARP since their website discloses that they share member info to third parties.
I believe legitimate telemarketers gave up calling people all together and now use other means of gaining customers.