They called my number and did not leave message. I call them back and discover that they easy to hot temper, no patience, irritated that I won't tell them my number 1st before telling me what kind of business they are. They said we are diversify interest company. Evasive by design cannot be good.

Caller did not identity themselves,  they simply asked for someone,  whom we believe,  had our phone number previously.  We have had this number for the past 10 years.  They still continue to call, repeatedly,  despite me telling them that we do not know the person they are looking for,  and how long I've had this number.