Harrassing sales people

We went to a certain shop where we wanted to buy a vacuum cleaner. Within a minute a salesman from Verimark came to us and asked what we were looking for. Without really asking our budget, he immediately went into demonstrating a R5000 Genesis vacuum to us. As he was demonstrating, the thing literally broke in front of us, with plastic parts falling off and stuff. Afterwards, we asked if he could rather show us other brands, and he reluctantly showed us the other brands but did not explain anything. Once we explained that we have a small house with only a small carpet area, he apologised and went ahead to sell ANOTHER Genesis to us, but instead of selling us a cheaper one, he obviously tried to sell us a COMMERCIAL GRADE vacuum cleaner. This level of trying to sell people stuff they don't need instead of an expert helping me find what fits my needs, is why I hate going to shops. Needless to say, we walked out without buying anything and will rather buy something from Takealot.