RM1202 Lawnmower

I purchased a RM1202 lawnmower and ****eater combo approximately 3 months ago at Builders Express Potchefstroom. These combo sets were available at Game stores, Builders Warehouses, Build It and various other stores but nowhere in Potchefstroom and Klerksdorp are replacements blades available. I purchased a blade for RM1232 which I was told was compatible with the RM1202 mower but after mowing about 4 meters of short grass it cuts out. There is hardly any grass in the grass catcher and nothing stuck in the blades. I sent an email to Ryobi with the problem but I have had no reply. Do I class this lawnmower as a disposable product.