Called 4 times in a row today, 3 times yesterday. Hoping this isn't a daily thing.

Those callers must be butter, since they are on a Roll!  Ha!  Sorry, long day.  I am guessing the calls will continue for a while.  You can wait them out, but blocking does work.  My land and cell carriers both offer free call blocking to a limited amount of numbers, some phones have call blocking features.   You have what you need to reclaim your privacy and sanity.  -  Be Smart, Be Safe.

Called 2x yesterday & 3x today...left no message

Caller unknown - Block Caller

Phone rang, I declined it.
Voicemail was choppy. Older female. Said her name was Hillary. Something about emails. Delete! Delete!
Just kidding :)
There was no voicemail at all. Added number to block list.