How to stop getting international spam calls?

I have been receiving 6-8 calls a day for the past 2 days from international numbers, mostly area code 685. My phone identifies them as spam and I don't answer, but it is very annoying to receive. I blocked the first ones, but now it's a different number every time. Is there a way for me or Fizz to block all calls from this area code in the future? Or any other way to get the calls to stop?

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