Poor Service At Makro Crown Mines

I am complaining about poor service I am receiving from Makro Crown Mines. A year ago, November 2018, we purchased a Ryobi generator. Since that day it has not worked once. We have taken it back to the store 3 times and every time it's given back to us we are told it is working but when testing it at home, it's not working. The recent time we have taken it back is Monday, 18 November 2019. One of the department managers told us that it is not Makro's fault but the supplier and that the supplier must be accountable. Now, my relationship is with Makro, not the supplier, as I bought the unit from Makro not Ryobi. It is Makro who has a relationship with Ryobi. The least that I was expecting Makro to do is to provide me with a working replacment unit and then they follow up with their supplier regarding the faulty unit. I just feel like I am not being serviced as I should be. This needs to be resolved by Makro.