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Saying this out of my own personal experience, Vodafone callers are usually someone from the production team. They ask questions on behalf of Salman Khan which he doesn't want to ask directly. Last year my sister wanted to ask a question to Sana Khan. They took down her name and place from where she was calling and her question for Sana and asked to wait for their call. Then she was never contacted back. But then in that episode someone from their production team itself called and asked a different question to Sana posing as my sister and flashing her name and place on the TV as the Vodafone caller of the week. That's how the whole damn thing works! Voting and Vodafone calls for contestants are subjective in this show.
please do comment on it so let me and others understand of caller concept