On 6 November 2012 the parties entered into a written instalment sale agreement in terms whereof the first defendant purchased a motor vehicle from the plaintiff for the sum of N$309 822,84. This amount included a single insurance premium of N$11 067 and finance charges at 9.5% p.a. in the amount of N$48 270,01. It was agreed that the first defendant would pay 54 equal monthly instalments of N$5 737,46 commencing on 25 November 2012 and each subsequent instalment was payable on the 25th day of each successive month until 25 . . .