Hung up after I answered the phone

Always hang up or try to sell me a warranty for my car. Call multiple times even after telling them to stop calling us.

These are recruiters for ISIS.  I hung up on them bigly.

They won't stop calling me

Yep, get several calls a day from these sheets of WELL USED toilet paper.
Must not have a single brain-cell in their collective office hive-mind, since none of them understand how a telephone operates.
I guess when you are a telemarketer, a.k.a. SCAMMER, intelligence is not important.  As long as your brain can allow you to read a script, your IQ is high enough.  25 - maybe 30 on the scale is sufficient!
Be really nice if we could shut down this group that comes through as "NAD"

Flaming A$$ H0LES......