you try to call back and they're busy.The number displays but unknown...

got phone call from this number about 5 mins ago. did not answer.

Ditto!

dito

I don't recall the name of the call centre calling, CH-something-or-other.  They wanted to confirm that I had received my free sample of meat.  I said no and that I didn't want to either.  They hung up rather quickly.  Had I said yes, they would have attemped to arrange the drop off of free meat (a half-pound of ground beef) by two very-high pressure sales people who would want me to sign a contract for 6 months of their meat deliveries before they would leave.

Me too, no idea who