The just call a work number at 3:16 pm EST. I don't know if this was meant for a employee on a personal call or what but this is rude.

These people call me several times a day, {Every day} getting my voice mail when my Do Not Disturb deflects their call.  They do not identify themselves, but call with the same voice and the same message:
"Yes, please return our call at 1-866-218-6690. Thank you."
&
"Please return our call @ 1-888-237-6830. Thank you."
I am clueless as to who they are, and I have a policy of not returning calls to those too shady to identify themselves.  If they are legitimate and not trying to scam one, they will usually say who they are.