They call with a munged up call display of %224153660714%22. The %22 is a control character. Regardles of that trivia they are bottom dwelling information stealing hacks trying to spam you with crap you don't want. I always play them the 10 hour air raid siren video I found on YouTube. They seem to hate that.
Possible bill collector calls universal work number looking for a co-worker - doesn't know first name. Says he's Jamaan? Lewis from IBM. Wouldn't leave message.
Same as top post. We get these companies all time wanting our collection business. I dump them into the CFO's v-mail as we already have a collection agency. They never identify themselves