Horrible service & product understanding

I booked my ryobi lawnmower in for repairs on the 21st of May. Never recieved any updates till last week where a lady called and said Ryobi sent a quote. I disputed this as the item is under warranty. She said the supplier alleges the machine was used without oil. I explained to her that was never the case, only my husband ever used the machine and he always checked the oil. When the machine started smoking and idling erraticly, we did however drain the oil when we checked and noticed oil was black. I didnt want to risk spilling the black oil in my car when transporting it to Makro. 2 reputable lawnmowever specialists has since warned me against these smaller ryobi lawnmowers, according to them these machines arent built to last and are of a low quality. I need an immediate solution as I'd like to obtain a better quality machine!!!!! No further feedback was recieved to date and these guys are not answering their phones at NewMarket Alberton.