It's Clever Contacts, ringing for some charity

This number rings often but when I ring back it's disconnected. I'm sick of it and putting the number as spam..

Bloody annoying..... I wish they'd piss off & get a job!

I picked up and they hung up. I called the number a couple of hours later and message "Optus advises the number you have called has been disconnected" plays.

I called back number (07) 3050 1910 reached voice mail for a company called clever contacts.

This is a company call "clever contacts " on behalf of a charty they don't say which charty ??