Note 9 android (sprint) can't call a specific number

I have an android note 9 with sprint. I also have 2 apple phones that my sons use, which are connected to my account as well. Suddenly i cant make calls to either. I keep getting the voicemail. Sprint is saying to go to a repair shop and ill be charged. I recently purchased all 3 of these phones and this is ridiculous! Any suggestions?

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