Consultant paid my lump-sum amount in the balloon payment instead of reducing monthly installment

I am very disappointed in how absa vehicle and finance operates.i paid 80 000 in my vehicle and finance loan in April, i requested them to reduce my monthly debit order but instead they paid it in the balloon payment, i have been calling and requesting them to attend to my query of reducing the installment but every time i call them i am given different references instead of them solving my query, someone is not doing their job right and i as the client is suffering from someones mistakes,i would be happy if someone attend to the matter,i spoke to this consultants Banele, Nhlanhla,Thatho,Samantha,Saide and Nthuli they all told me they have logged my query, but for the past 4months nothing has been fixed.