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Hi @Amie1,
There's not a way to do this by default in the Xperia X, however there are third party apps that have this functionality.
I think TrueMessenger should do it for example, but there's plenty of others available on the Google Play Store.
But please be aware we cannot guarantee the effectiveness of third party apps, nor provide toubleshooting for them.
@Amie1: you can also try to call your network provider to block that number from reaching you