Problem in contacts of my iPhone?

I have an iPhone 5c of iOS 7. Whenever any phone in the world calls me, only and only 'unknown' displays on the screen and no number is shown while the phone is ringing. When I miss a call from someone, the notification comes, I see it and again only unknown and no phone number. And what's worse! I can't call that number back! I tap on that unknown bar, it darkens and again turns white! Duh! It is getting on my nerves! And same happens with the number which are already saved in my contacts! Please please please help me! There's no such option in the settings as well to fix it…

Call your carrier and tell them your caller id is not working.

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