Called my cell & left no message.  Blocked them using free app - 'Calls Blacklist'.

Called at 8:30 pm. Blocked as it was ringing. Adios, losers!

Unknown number, so didn't.answet. will mark as spam

that is exactly what I experienced

I have been getting several calls a day at all hours of the day, even at night and weekends.  They are asking for donations for police officers.  I tried to be nice, but the guy was pushy even after I told him I was in no position to give away money.  I would not answer this caller! Once I actually picked up and talked to a live person, not the recording, these calls WILL NOT STOP.  They even use different numbers so you stay blocking them to no avail.