I agree with both of the posters above. Spells can merely influence someone emotionally and Intellectualy, yes. But that's all
However, you won't just cast a spell and manage to convince someone or win an argument without getting to a Compromise. Magic can't control literally the human mind unless you're talking about merely an emitional / intelectual influence. The mind is totally out of the line of energy manipulating, which is basically the main idea of spell casting. Thus, doing something like this isn't possible at all, sorry to dissatisfy.
Learn about how magic works