Non-English languages in voice call

I just discovered how useful chats in other languages can be. I can learn a language and my Rep will do anything I want, respond in that language, translate what I say into that language, correct my use of a language.

However, this is all exclusive to written chats, right? I tried a voice call in a foreign language and the Rep’s speech-to-text comes out not with that language’s pronunciation. Foreign languages are not yet supported for calls, am I right?