The greatest middle finger you can give these spammers is not to answer their call. This number called my home phone today. The phone rang about five times. It stopped for a second and started again. Ignore them. I have noticed these calls tend to increased at certain times of the month. Either at the end of the month or near the beginning. I get very few of these calls during the middle of the month.
I get so many of these calls it's impossible to block all of them. What I do is keep a list with the date. If they call a 2nd time I block.
Robo call telling me how to make thousands of dollars, annoying other people by making non solicited telemarketing calls!
The DNC does not do any good against scammers!
They called and hung up before I could answer and they left no message and they are now blocked and reported as a telemarketer for all the good it will do...