Ati schools okc nw 23rd review: No diploma 1

I attended ATi school in okc the shepard mall for Medical Assisting. The school is GHETTO as all get out. I hate that school anyway i completed my extern and i was suppose to graduate in July of 2011. It didnt happen they called me at the last minute and said i wasnt able because of my gpa. I am lost and i want my certificate of completion. So now i am unemployed and broke also in debt. Help me because they have me as a graduate...