I get them frequently in Australia. Calls claiming (but likely faked with VoIP) to come from various places overseas, and from within Australia. I get a few different types:

a) Recently it has been computer voices leaving me voicemails claiming I've ordered thousands of dollars of stuff on Amazon, and I need to call some number to cancel the order

b) I got one guy claiming to be from a major ISP and saying my Internet was broken and he needed to help me fix it. I knew it was nonsense because I don't even use that particular ISP

c) Recorded messages claiming the Australian government is going to prosecute me for tax evasion, and if I just wait for the call centre operator to come online, they'll fix the matter for me by accepting payment of unpaid taxes

I think they are just dialling random numbers, looking for easily-tricked people.