[JimSEA]

If it’s important, they’ll call back. A good assumption to go on. If you don’t know the call back number, it’s likely a scam of one sort or another even when they ring more than once or leave a call back number.

[Eric in the Ozarks]

I'm on both Missouri and US “do not call” lists. Yet, I got two credit card interest rate scam calls this afternoon.