I deleted my email account on my iPhone 5c and now my contacts keep changing?

I deleted my email because it wasn't loading any of my mail and I thought that deleting it (not the icon or app) would restore it back. But then after I deleted all my iMessage contacts were gone which was quite a lot of people. Even though I tried changing all of them to their names, most keep changing back to their email names or numbers which frustrates me more. How do I solve this? All the numbers are gonna just iMessages.

You gotta add the email again… Then delete it and choose "keep contacts", that's the way you do it with Facebook, I think it works the same way?

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