Arçelik Turkish Coffee Maker is Always Breaking Down

I own an Arçelik Turkish Coffee Maker, and despite it being under warranty, it has been sent to the authorized service three times on October 27, November 26, and December 23 due to recurring faults. Each time, I recorded a video of the issue and showed it to the technician. They acknowledged the problem, claiming, "Good thing you recorded this; otherwise, we wouldn't have found the issue," and supposedly fixed it by calibrating the device. On December 23, facing the same issue, I insisted on a warranty-covered replacement rather than further repairs. Two days later, a service technician called, stating my machine was ready, but they found no issues. When we set it up together, he questioned my coffee measurement method, insisting I fill the spoon to the brim, blaming the machine's issues on my brewing style. Despite showing him videos, he disregarded them and left. I reported the situation to Arçelik via email, receiving no response. Is it normal for a leading brand like Arçelik to have a machine develop faults suddenly, even when following the stated guidelines? Can they deny a malfunction, deceive customers, and refuse to accept faults even when users adhere to the manual? Is it absurd to request a replacement after the same issue persists for three consecutive months? Meanwhile, my machine went back to service on December 26, returned with a "no problem" note, and still the issues persist.