I have caller ID. If I don't know who it is I will not answer the phone. I have an answering machine. when the answering machine picked up the party hung up. . I am on the "Do not call list".

got call rang 3 times i did not answer, they are unknown

Pioneer Credit Service...even though they dont tell you that...claim to need employment verification.  Called the office but left on the Voice mail they left it tells you to call (866) 269-0779.  looking that number up gives you "PIONEER CREDIT SERVICES".  Debt Collectors.

I answered the phone "Data Center" a woman came on the line and she seemed confused. I put my hand loosely over the phone and acted like I was talking to someone. I said to the fictitious person " get a trace on this." she hung up that was the end.

no voice mail