Worst experience in my life. I'm angry I'm sad I'm...

Worst experience in my life. I'm angry I'm sad I'm frustrated! I bought my first vehicle and this is who they gave me. They always give me different amounts every time I call and take my money. I pay on time and double what I'm supposed to pay since April and recently 3 months in a row the ending balance has not gone down! I called and not even the manager could help me or explain why! Just taking advantage of ppl