Can an employer make you speak spanish at work?

If you work in a call center and you are both fluent in English and Spanish but initially you were not contracted because of such skill. I was contracted to tend to regular costumers in English. Can they decide to make you speak Spanish without changing your position or paying you extra without any consent?
I worked for them for two years in English and they just added this new pilot in Spanish and they just made me work it, which I don’t feel comfortable doing.

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