Can I block a number and have it not be able to leave voicemails?

I'm trying to avoid my dad getting a voice mail from the school to go to a parent teacher conference night. This is the second one and if he goes it will be a second time my dad gets disappointed. The conference is on Monday! I can only hold on to his Iphone for a while and the school calls and leaves a voicemail through out the whole weekend! Maybe 4 or 5 max. The last time there was a conference even in the morning when we were on our way to the school they leave an extra one. It's like the school is really trying to make sure parents get the message. I get his Iphone so he won't here it when it rings then I delete the message they leave. I can't catch them all and it's pretty irritating. One of the voice mails my dad is gonna hear! Please help! I want to show my dad my grades later when they are way higher so I won't have to worry about getting yelled at. How do I block them on the Iphone?! And if I block them will they still be able to leave a voicemail?!

Just do your **** and the school won't be calling him all the time.

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