There is nothing wrong with saying it in an Indigenous language, but the fact is that GNWT is a public government and Canada is a bilingual nation. Until Indigenous governments take over certain services and service delivery, those are the laws that we have to follow.
I don't think that answering in one language denigrates or reduces the value of another language. I was talking with my spouse about this the other day. She was saying her granny spoke many languages, and when I think back, my grandpa spoke many languages. He was from Fort Chipewyan. He spoke English, French, Chipewyan, Cree. I don't think there is anything wrong with offering service in a number of different languages. I think it's something that we can all strive for as opposed to resist.