Hatchback/liftgate Support Device problems of the 2007 Chevrolet Equinox

In July of 2010, I noticed the sound of liquid coming from the back that wasn't normal. I just assumed at this point that it was my gas and I just never paid attention to it. . . I had convinced myself of that because I knew we didn't have drinks or anything in the car. In December, my husband accused me of having a milk cup in the car from my son. Nothing there, no food or drinks, etc. As we were looking for whatever was causing this terrible smell that smelled like a milk cup had sit in 100 degree temperature in my car, we noticed the carpet was wet. The smell was so bad that we had to roll the windows down and in January where we live it is 10 to 40 degrees, so either temperature. . . Not warm enough for windows down. I was then accused of spilling the milk. . . Crazy! I knew I had not! I got to reading online and found out about the leak in the spare tire well. My husband felt so bad because I did not do it! the water was standing in my spare tire well and leaking out into the whole back floorboard! soaking wet! that explained why every time we rode the car we got sick. . . Literally sick. From upset stomachs, to stuffy noses, to burning eyes and noses, etc. . . No kidding! mildew or mold. . . It doesn't matter! neither are good. Gm says they won't pay for or even look at for free. Just to have diagnosed is $80. 00 not including the repair! they say I could have left the liftgate open when it rained. . . Oh come on!!!!!!!! just own up to it and fix your problems! if that were the case I wouldn't have left it there for 6-8 months!!!! I would have sucked it up with a shop vac at least before it flooded my car and made us all sick! I am very upset with gm regarding this issue. My car is out of warranty and gm will not fix their issues that "how many others are having again"? this is uncalled for and very poor business for our american's employment, people will start buying foreign made! need a resolution and not out of my pocket!!!.