Not happy with service and attitude of manager

I bought a vacuum from game on 19 December, after being convinced that the Tevo machine was better than the Hoover which had a lot of problems. I took it home, it never came close to doing what I was told. On 26 December I took it back to game for refund and to get the Hoover. The consultant behind the counter said they are getting a lot of comebacks and people are not happy with the machine but the Tevo rep needed to advise. Devan D was the rep at the time and he was rude, firstly tells the consultant to book it in without explanation. I asked him what he was booking it in for he says we cannot change it because it was used. He then tries to explain the cpa act to me, as far as I am aware, if u are told that an item does something and it doesn't it should be exchanged for the same product, a different product or you should get a refund, and u would never know if it works if u don't put it on and test. The manager also refused to assist. Today is 7 jan, i called the store and they say the vacuum only got sent away on 6 jan. Is this the way game treats its customers? Lie to them and take their money, i used the vacuum once and game has it and my money for longer than I have.