Want to appeal admissions decision?

I don't think they will appeal your decision. Try to look at it from the admissions committee's point of view. A student is having a lot of bad grades, so they don't want to add this student if they will simply do poorly in their school as well. Now I'm sure you're a good student and can do really well but you have to SHOW it to them. Do a year in community college or 1/2 a year and apply for spring admission ... but you have to do very solid, straight As if you can...