It is not that hard to find out your cumulative GPA if you have credits from two different institutions. Go to your universities site where you find out your grades (EVERY SCHOOL has that) and then find the site where you can put in your community college user ID/name to find out your grades. Add the amount of scores (grade x credit) from both schools combined and you got your GPA. It would take maybe 10 minutes to put all your grades on an excel spreadsheet and find the GPA if you want to double check. And cumulative GPA isn't everything because your science GPA is just as important. I don't know anything about podiatry school's grade replacement or the community college credits because I have done neither.
Since you said your bad grade was gen chem I assume you took that freshman year like most pre med students. UPWARD trend would be important. Like SomeHelp said, we are all (or majority at least) of use are PRE-podiatry students and he is correct that you don't need a 28 on your MCAT unless you are applying to MD school. You say that you got A's and B's in your community college courses you didn't equate into your cumulative GPA, so you are higher than a 3.12 at least. I think if you get a 23 or 24 (like SomeHelp said) on your MCAT you should get an interview.
I did take one of those KAPLAN courses and personally I don't think it was worth $2,500, but it was a good course. They charge so much because they know that to many pre-med students raising your MCAT score by 2 or 3 points is well worth the $2,500. Also, lots of pre-med students do come from middle to upper class families and know that the one's who come from the richer families are more likely to spend that money to benefit their future. I had Kaplan books from a family friend who took it back in 2009 that I would have used had I not taken the course, but the part I would not have gotten was the online aspect of the KAPLAN which is just as good as the books.
It also doesn't surprise me that the school didn't give you much information if the stuff you told them was what you posted here. They probably sat there and thought to themselves "This kid didn't give us his CORRECT information so why should we give him the correct answer he wants." Next time you email one of the schools you are looking at don't leave them thinking that you didn't do your own research to begin with.