This number calls acts like they know you then starts harassment for payment. However, if you don't *agree to some sort of payment*, he will not tell you what company this is.  is supposed callback numbers differed from the number that caller ID showed.

calls at work gives no information and is extremely rude

This is an outfit named Hymen Roth's scam collections.
A guy named Adam Daniel's called and told me he was starting a escort service and planned to un it by hand and mouth. When I told him I wasn't interested, he then tried to claim that I owed him 5000 dollars for services his mother, wife and daughter performed behind some bowling alley .
I plan to address this the next time he makes the mistake of calling.

calls repeatedly for an employee here, and also calls her cell phone.