This is not something that can be arranged.
You may be able to block them individually as they come through depending on what handset you have and what settings it has available.
I share your pain!
If it gets too unbearable you can always change your number if not too inconvenient.
For the past few days I've been getting numbers from Africa calling me, each one with a different number and each one rings for just a second or two, there really needs to be a way to block ALL international calls on Optus for people who never use international calling. This is really getting annoying now.
I'm very sorry to hear you're being bothered by these nuisance calls. I'd recommend blocking the number from the options on your phone and registering your phone number on the Do Not Call registry if you haven't already done so. More info on that and How to stop unwelcome calls, scam calls & messages.
Unfortunately, the nuisance/scam callers have crafty means of obtaining your phone number and once they do, all you can do is block the number they're calling from because they can just use a new number next time. If it does become too regular, you could always request a new number. More info at How to change your phone number.
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Blocking the call doesn't work when they use a different number every single time, you just end up having to deal with it every single time.. Really need to be able to block ALL of a certain number type.
They're ALL coming from numbers starting with '+21' (Africa), need the ability to block with wildcard all numbers starting with those first three characters.
Why cant you activate call barring features on mobile phones where people can block the prefixes of the nuisance caller and block a network of nuisance calls? Telemarketers and scammers just use another number after you have manually blocked it, why cant we just block a whole country or network by using the prefix of the nuisance caller?