vacuum attachment faulty after 4 months of hardly using it

Good day

I am very disappointed with one of your products. My mom has a Genesis (Hydrovac Turbo) vacuum carpet cleaner and one of the attachments, the vacuum head with bristles is faulty as the bristles do not turn. This attachment was bought on 1 June 2018 (which I have the proof of purchase), I went over the weekend to have this issue remedied and I was told that as this is exceeding 7 days after purchase there is nothing they can do for me and I must buy this attachment again. Yolande the manager at Northmead Square advised this. This is utter nonsense that you manufacture such bad quality products, after only 4 months it goes faulty and I need to mention the fact that my mom cleans a small carpet in the lounge, so the vacuum is really not used a lot at all. The products and service is a joke- pathetic to say the least I am going to make a big stink about this.