Well once again these numbers have tried to get me to answer. 0478 017 906 isnt a known number on my contacts list. 2 calls on the 22Feb within an hour ( 3pm to 4 pm ) & again today the 17th June 5.46 pm & 5.49 pm. ( trying hard to get me. hehehe. ) Maybe I missed blocking it last time but its blocked now. They never ring long enough & hang up. So no contact with a human. I hear a computer dials randomly & when some sort of contact is made the number is considered as a confirmed active number & fed into a recall list. Best bet is to block them. Hmmm just saw the last time this number was reported... Just a coincidence that my contact dates were exactly the same dates.