bad client service MFC

I made a arangment about car payments,i called her and tried to explain my situation but she had a rude attitude she didnt gave me a chance to explaine to make a arangement.she told me that its not her problem.she is not handling clients profesional and i want feedback from her line manager.she false accuse me of hiding and says that she dont get hold of me,she doesnt call me,alshe calls other people regarding my fianancial situation.