Poor after sales service - new vehicle warranty

I would like to thank Toyota South Africa for finally showing their true colours of poor customer service and overall don't care attitude towards me the customer. My perception of Toyota's superior quality and service is gone now and I no longer trust what Toyota is saying about reliability and the best after sales service. My Toyota 2019 Yaris have a problem with paint fading and peeling off around the door frames, which was reported to the dealership where the car was purchased. The car was still under factory warranty when I logged this warranty claim, all maintenance done by Toyota dealer and I take very good care of the car as per the owners manual. The warranty claim was rejected by Toyota for reason I use the incorrect car shampoo when cleaning the car. I am using a good quality car shampoo manufactured by Shield and nothing else, by the way. After this brush off by Toyota, I now see that my future business as a customer is not important to Toyota. I personally own two Toyota cars, 2016 Fortuner and this Yaris. When time for replacement is due, I will not consider buying any Toyota again, and not due to any fault of the dealership but Toyota South Africa not honouring their warranty commitments towards me the customer. Thank you again for the poor customer service. You lost a customer.