Not happy with Leandre's service from Audi center Centurion

I called AUDI center Centurion a Leandre answered the phone in Afrikaans and was adamant to address me in Afrikaans while she could figure that I don't understand the language, I understand that Afrikaans is one of the official languages in the country; I thought the business language that Audi use is English. I don't have an issue in one answering with 2 languages to ensure you have covered everyone. Just think what will happen if a staff member at AUDI answers an English speaking customer in Setswana or IsiZulu.