inferior product!!!

My father bought a ryobi skil saw from game in mitchells plain. I removed the 2pin plug that comes with the saw and replaced it with a 3pin plug(voiding the warranty) but the problem we are having is that the saw no longer works because the armature burnt out! Only after less than 3months of owning it... so we sent it back to game and they sent it back to the supplier who said its the armature that burnt out and the reason being \it was over worked"?! How? We used it for d.I.y projects around the house. the reason was not because I changed the plug but because of it being over worked that is the biggest load of bull **** that I've ever heard! That being said! I just want people to know that RYOBI products are inferior and does live up to its standards or any standard whatsoever!!!"""