Tank Mounting problems of the 2005 Kia Motor Optima

In October of 2006 we bought a 2005 kia Optima. Shortly after the check engine light came on, so we took it to the dealership and they told us it was air in the tank and just to open the tank and let the air out. They said the sensor would go off in about 60,000 miles. We then started having problems filling the tank up and the sensor continued to come on. We kept doing what the dealer said to do. On 13/14 of October, 2008 we started smelling large amounts of gas fumes and it continued. On October the 17th, 2008 I filled my gas tank up and started doing errands when we noticed that the fumes were really bad and my gas tank was dwindling and went home. We noticed that the gas was coming out very quickly, but stopped at a half of a tank. We called kia and they told up that our warranty was up, but we could have it towed, but they said that we needed to have the fire department come out and empty the tank because it could cause a fire and they would not tow it. I was driving with my child and could have been killed. We did what they said to do and there was a lock, so it could not be seeping. We called kia back and after telling them that it could not be done,so they came and towed it. They are replacing the tank, but were charged almost 1000. 00. My car has a little over 70,000 miles on it.