This is one of the numbers used by a dodgy trading / options mob which uses various names like Inside Option / Option Method. It's an Australian number but it's usually an American on the other end, and all their other numbers are from overseas. They advertise through spams, use fake testimonials and try to apply pressure tactics so you join and lose your money to them.

Scammers, best ignored or blocked.

This number keeps calling and calling all the tine even when I say I am not interested.

calls same time twice each. If I answer, no one talks, and if I don't answer, I get a long silent presence at the other end.