It's simple. Have a strong policy - No Voicemail OR SMS Message then don't return call. If it's an URGENT call they'll find you anywhere in the world
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I really got stuck into Telstra last year as I was getting these types of marketing calls where Telstra had sold my number to Tibet and Telstra said that they can't stop these calls to business numbers.
Well, it so happened our Digital Contract was coming up for renewal, and you guessed it, they solved our problem.

Another invasive strategy to extract money from people against their will. Block it

I have had this number call me previously several times, every time you answer they hangup without speaking. Very annoying. Called the number back and a recorded female aussie voice say it's World Vision and they'll call again. Why bother ? you don't talk to me when you do!

Happened to me twice, I've received calls from World Vision before, there were people on the other end, don't know what happen with this one, I am blocking this number from now on.

rang 3 time in the hour and never anyone on the other end
looks like i can now taken World Vision OFF my Christmas lisst

I received a call from this number but they did not leave a message.

Calls then hangs up

Same issue as other here - call to my mobile and no answer when picked up

Same deal. Called me on my mobile. Silence on the other hand when I picked up. Hung up a few seconds later.

World Vision, if you call back there is a message to say they have called recently and will call you back

Called me on my mobile. Silence on the other end than they hung up.

Thanks for sharing this one. Have blocked it.

Probably Indian telemarketers using a supposedly World Vision number. W. Vision does not call and hang up. Some dumb arse telemarketers do.

Received a call to my mobile. Just silence on the other end than the call hung up.

It's annoying to rush to answer the phone and find nobody there, let alone discover it was WV, which I send some money to when I can. At least WV is a charity. I too often get calls from creeps who just want to get inside my computer.

Sorry World vision, I don't want pesky calls on my mobile - which I never gave you ... or anyone.

Keep getting calls on my mobile but there is no-one there ever. Very annoying... I rang back to find out who it was,... World Vision Australia... all automated.. no person.

Also donated in the past but will not contribute due to these pesky calls

Sorry World Vision you've lost me as a donator. Don't want your snail mail. And certainly don't want to be disturbed constantly on my mobile. I used to donate regularly twice a year - unsolicited - but I'm scrubbing you off the list and putting in another less pesky org.

World Vision or at least a call centre claiming to be / working on behalf of. And no, they do not leave messages