SA taxi finance is treating it's customers very bad.

I'm very angry and frustrated about the service get from SA Taxi Finance ,this company doesn't care about its customers, all they care about is our money. I was financed by SA taxi finance in 2014,the interest is unbelievable 27%. Finance agreement runs for 66 months from 2014-12-07 to 2020-05-07 What bothers me most is,after paying my last installment on the 15 of july 2020 the company send me a settlement amount of R8 200.How can I get a settlement letter for the account that is fully paid up? On the settlement letter they changed R5000 for insurance and my monthly payment is R1800. They told me my account is R2 900 in arrears also My account is handled by Tsholofelo Mataboge,she is unprofessional, she doesn't answer my calls or return them to update me regarding the account. I have paid the R2900 but till today my account is still open not closed. I think they still want to demand more money from me.