Car finance

I took out finance with absa bank buying a car in January 2018 first payment was supposed to be on march on the 7th they never debit late march I call telling them they ddnt take the money they debit order date was the 1st of every month I told them to change that to the 7th each month bt still it was change April they didn't take again I called again they said they will take on the 15 they never did now there is a guy who came to my house to reposes my car coz I'm not paying now it like it's my fault and I have been calling absa to try an work with them but no joy please help me SAP when u get this sms Contact me on ********** 997