Sunny, how awful. I think you did the right thing by sending your camera back to Canon. I remember reading somewhere that you should never blow into your camera or even on a lens. Bacteria from your breath can actually grow on your lens or camera. I'm not sure if that's true or not but I use one of those rocket blowers and it works great. Hope you have your camera back soon. My son sent his camera to Canon and had it back in about a week.
Anita
Anita