When folks don't get in it can be broken down into Scores, grades, experiences/personal statement/reccs, interview skills, and applying realistically. Anyone of the those five areas can be detrimental to your overall application.
I am not sure if the MCAT was your issue unless you did very poorly in one section and rocked the other two. Even with a L.
Look at your whole application: First how many schools did you apply to? Were they all top tier? Did you have state schools you applied to? Consider broadening where and the number/type of schools.
Second: Are there grade issues? Allo's average any retaken course, DO's will replace. either way any failed or low graded course needs to be addressed,
Third, do you have enough clinical and volunteer expereince. Is your PS solid? Do you have rockstar reccs?
Fourth, not sure if you got interviews, but if you did...think about how to improve.
My best advice is to go to a advisor or someone in the fieled and make sure your application is top notch before throwing more money at the process!
Hope that helps.
Marcia