I have the same thing happen, except they call roughly once or twice a week and hang up as soon as I answer. It's frustrating because I run a small business and my landline calls are diverted to my mobile at great expense. These calls cost my business upwards of $200 a year.

These people are such a nuisance. I am on the do not call register but still I keep receiving calls from them. Thank goodness for Caller ID - at least I know what calls not to answer.

I'm getting calls from this number too that do not leave messages. I phoned the number back and it said "thank you for your call, you were originally phoned by Mission Australia". They'll be seeking donations

I've had numerous missed calls from this number and they don't bother to leave a message. When you answer there is a distinct pause like there's going to be an automated response. You ask "Hello?" and no one answers so I hang up. I get several of these calls per week and I'm on the "Do Not Call Register"!