Who called from 3139306137

I received several calls from this number also (313 930 6137,) After each call, my device indicates that who (or what) ever called me left a vc msg. However, when I check my voice mail, all I.hear is dead air. Hmmm. Strange

Calls and leaves no message. Calls over and over.

It has to be robocalls,I called the # and spoke to a human,they said(sorry we'll look into it),10 mins. later they called again.

did not answer---do not know anyone in detroit, mi
caller id----detroit, MI
VOICE MAIL LEFT-----NO MESSAGE

Call trying to sell male enhancement supplements. I told them to take me off of their list.