I just had 2 numbers call in succession 1. 0480 051 121, then 2. (03) 9989 1776, the mobile number look up indicates some SCAM to win free iPad/iPhone, etc. the landline hangs up, my strong feeling this is ONE place trying to ring the unsuspecting many times in a short space..... suggest you BLOCK both numbers, keep a record of this behaviour for Telecommunications Ombudsman as complaint.

I called back number (03) 9989 1766 rang 5 times then goes to busy tone.