Disgusting customer service

I am absolutely appalled by Teljoy and their lack of customer service or care. I am renting a dishwasher from them and pay my account every month on time. My dishwasher had an error message last week Thursday that said I needed to turn off my water supply and call the manufacturer. I called Teljoy, who, after days, sent the most disgusting repair company to my house and said I had installed the incorrect pipes and was to pay them R1400 on the spot and that my warranty had been canceled due to me not using the correct pipes. This man was shouting at me and demanding money from me in my own house. I have never had a dishwasher so other than out the box that was provided to me from Teljoy where the hell would I find pipes to install the dishwasher? I have called the call center over 15 times to try get feedback and keep getting told I will be phoned back. I have never experienced such rudeness and lack of care from a company that relies on clients to pay their salaries.