Entitled waitress

I visited the branch in Menlyn. I was served by an older coloured lady. The service was slow. I chose to not tip, and the waitress tried to coerce me into tipping. I insisted that I won't tip for subpar service and was met with passive aggression. Please pay your staff, it is not my responsibility to pay them for you especially when the service is **** poor. And please reinforce the fact that tips aren't something they are entitled to, so they need to work for them