Terrible Customer service for product under warranty

I currently have an issue with an Amalfi Shower column. A service called was logged this through replacement and about month later, they only replaced the shower head. I went back to CTM Menlyn and Mark H was called. I spoke to him and he said to me “I was lucky they replaced the shower head”. This product is still under warranty. He further stated that my house’s water was too hot. This gentleman Mark, then Hung up on me; in the presence of his colleagues inside the shop. They were professional but Mark is an utter disgrace. I am in the customer service space and he should NOT be customer facing, with his belittling attitude. He acted as though it was his family business. I can only imagine how he treats his colleagues if that’s how he treated me as a customer. If there are tricks not to replace products under warranty, then it’s as though I am being **********. Very disappointing from such a big company like CTM. My ticket reference number is : 052663