No Refund at Marko cornubia

I am very disappointed with the service received from Makro cornubia and Ryobi Springfield park. I have 2 children, a 4 year old and a 3month old. My lights had been disconnected, so on the 23/04/2019 at 16:48 I had purchased a Ryobi RG 950 generator from Makro Cornubia. When we arrived home the generator started and switched of and did not idle, it did not start again. The reason why I purchased a generator is because I needed electricity for my minor children. I took the generator back to Makro Cornubia the next morning 24/04/2019 at 10:38. Upon many disagreements with staff and management, they instructed me to personally take the Generator to ryobi in Springfield park which I don't understand as I've purchased it from Marko cornubia. I was unable to take the Generator to ryobi so Marko sent it to them on my behalf. I stressed that this was urgent and I need a refund because I don't want to have problems with the Generator again. On the assessment note from Marko cornubia it states " customer does not want the unit repaired, customer wants a refund" today 9 working days later Marko call and tells me that it is not a factory fault and I must come to pick up the Generator they cannot give me back a refund. I find this service to be really pathetic because in these 15 normal days, I couldn't keep my kids in the dark and I purchased another generator from another store which I'm happy with. I cannot keep the one from Marko as I have no need for it now! Extremely dissatisfied with the service from Marko, I only had the Generator for a few hours and they say no refund! What happens to the 7 day money back guarantee?!