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You can add that contact to rejection list and it will be blocked by your phone automatically.
If you have any questions or would like any additional information, please don't hesitate to ask.
After adding that contact to Auto Reject list, make sure you save it. If you want to remove it from rejection list, just delete that number from there.
There is also another method. In Logs, touch the contact you want to block. This will bring contact/call info. Tap the options button and tap Add to Auto Reject list.
You can also use third party applications like Call Blocker to block numbers. Open Play Store, download Call Blocker and you can backlist numbers using that app. If you have any questions or would like any additional information, please don't hesitate to ask.