Stop harassing me

I bought a car in Autopedigree meadowdale,and I was financed by Mfc,the car problems I complained about it,the manager was rude to me,Patrick,I asked so many times to change it,he kept promising and never delivered,now I lost my job,and I call Mfc to take the car since I’m not working anymore,I even sent them a letter from work,they took the car and I’ve been paying them every month now they are busy harassing me with calls ,emails and endless SMSes busy telling me that I need to pay them R159000,I took the car back because I don’t have a source of income anymore,and how do I pay for something I don’t have?im sick of this.with the car problems I even went to oumbadsman in August 2019 till today they never responded I tried calling them a couple of times without luck.Thulani Mahluza.the car was a Hyundai accent 1,6 2017 model.