Add my vote to getting some attention paid to this problem at the carrier level.  It seems like lately I get two to five of these calls a day.  But blocking them does no good, because they use different numbers every time.  If I do answer them, no one says anything.  However, within a couple minutes, I invariably then receive a second call from a different number trying to sell me something or phish information.  It's as if the first call is just being used to see if someone will answer.  If yes, the second call gets generated.

If the carrier has the ability to detect and stop this activity - they need to do it now.  If this gets to the point where I need to change phone numbers as the support person previously suggested, I will change carriers at the same time.