Rude assistant

My mom went to spec-saver today, while Fifi was assisting her in choosing a frame she had to finish off something and asked the other lady to continue with my mom. My mom asked the lady which frame with go well with her face and she rudely rep**** "wonke ayafana" meaning they all the same. Im so sick of not complaining about bad service because we don't want people losing their jobs. If she doesnt enjoy her job then she should leave so somebody who really needs her job can take over. My mom is a pensioner theres hundreds of frames in that place and she's telling her they all the same. Does she treat her mom the same way? If she doesn't want to deal customers and she'd rather be somewhere else then she should go. I am super annoyed maybe she should ask Fifi to give her some customer service training.