PG Glass Discovery call center - I have received the worst service ever from Keletso Nkosi

PG Glass Discovery call center - I have received the worst service ever from Keletso Nkosi. I called in, and when I asked him a question , he laughed. When I asked him to share the joke, he said he was laughing because of the question I asked, so to him, it was a joke. I'm really disappointed in how he conducts himself