Disgusting service from manager

bought a SCHULTZ GRINDER on the 11/06/2019 today 17/06/2019 tried to use the machine and it did not work properly. Took it back to the shop and reported the malfunction to a manager that calls himself Gabriel Moluleki (mind you he did not have a tag) the rudeness of this guy! I am disgusted at the treatment I received from this so called manager as though I did not buy the machine with money, he literally treated me like a **** and ***** he kept insisting that there is nothing wrong with the machine although when testing it the machine wasn't working properly, I kept telling him that I do not want money back but a replacement but he wouldn't listen or try solution like a manager would be expected to! the treatment got me so angry that I left him with the machine at the store - whilst interacting with him he had the nerve to talk to the staff in a disgusting manner, first being rude to an employee that is working 4 hours, wouldn't sign her out rudely speaking in front of me, the second was wearing wrong pants for work he had a confrontation in front of me, then had the nerve to call his senior and tell him that he wont ever discipline staff cause he lets the get away with it then bangs the phone. despite my effort telling him he cannot treat people like that or have confrontations in front of me as a customer I was totally ignored!!! wow, I am angry, disappointed and mostly disgusted at the quality of managers we get to experience at shoprite! I am so put off right now and need someone with authority to rectify this horrific experience!