How to block incoming blocked calls?

This person keeps calling me blocked (on my cell phone, i have the iphone 5 on at&t) over and over again, i finally answer and say hello and they hang up, and keep calling blocked… How can i make it so my phone won't accept blocked calls?

Ask AT&T customer service. If your phone can set different ring tones for each of your contacts, you can choose silence as the default ring tone.

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