If your friend is pranking you, that's a rough way to get pranked, since there's no way to recover deleted characters.
English
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I'm sorry... but someone who would do that to you is not your friend. The first thing I would do is change up your password and/or lock up your console (if this person is a roommate). Then, ditch your friend.
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I know, because I switched to PS4 and before HoW, my friend deleted my hunter which at the time, had Gjallarhorn.
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Ditch your "friend" such a person is likely to urinate on your bed and say it's a joke ;)