too much calling but noone talkin

This number keeps calling my work cell  phone.   Over and over ... with a fax tone.   but I get a its been disconnected message when I call them back to try to get them to quit calling.

Called 2 times in less than 2 hours-no message-called number & received message it is disconnected-surely a scammer!

A gentleman just called me from that number and said he was a debt collector and I had failed to pay something. He had a an indian or middle eastern accent. This is one of many random Phone calls I have recieved. For some reason it was very hard to make out was he was saying,,My guess is it BS. Not very proffesional so it must be phony

This number keeps calling me and when I pick up no one is there. It's 1pm and they've called me six times today.