Worst brand Samsung

I'm so horrified about Samsung's service that I don't even know where to begin. My 40-liter Samsung microwave (SN J6GT7WFW701700X) was purchased on March 17, 2024. One evening in July, it stopped working. I returned it to Hifi Corp Wonderpark, where it was purchased, and an appointment was made for repairs. A woman from Hifi Corp called me today to explain the outcome of my microwave. She said that I was billed R1098 for a roach infestation, and that if I didn't pay, I would have to pay an R450 rejection fee. What kind of foolishness is that? Why didn't I receive this information when I purchased the microwave? For what does the warranty apply? Sincerely, I don't understand; Can this be sorted out, I need that microwave working. Kindly assist

I only used it for 3 months, its unfair.