air bag in kia rio 2003

I got into a pile-up on the hightway and ened up rear ending a car in front of me. Going at least 80km, I hit him staight on and my airbag did not deploy. This is a leased vehicle and I don't want to drive it any longer. They better replace it with a reliable car until the lease is over next year 2007 (without a penalty) I could have been killed!