Disgusted

I went to Verimark the Glen on 07 September 2019 and purchased the Flawless brow machine. I called on Monday and spoke to a gentleman advising this products does not work as advertised and he said I should bring it back. I went back today and the 2 ladies working there was abrupt and said that products cant be changed for hygiene reasons. They spoke loudly infront of other clients. There is now a sign up saying this product cant be changed and when I asked why it wasnt there last week when I bought it they said no it was probably on the other side of the counter. I then asked why they didnt tell me it cant be exchanged and now they saying they did which makes me a ****. I'm so disgusted in the way I have been treated and verimark advertising products that doesn't work the way it is supposed to. Now I must be stuck with a product that I can never use. Where is the CPA in this or treating clients fairly.