They have rung just about every day for the past month or so. I will get a phone call just before lunch, than another during lunch time, and for good measure, around tea time. 3 times a day, using this and other numbers. This has been going on for the past few months. Time for me to get another phone number!

Got a call from this number then when I tried to call back "Optus advises that this number is disconnected".