Complaining about the vehicle subsidy

Good day.i bought new datsun go plus from the dealership in pretoria known as Sa new car solution.i signed a contract with subsidy of R12000.00 and the sales person who delivered the car on 8th of 11/2019 we agreed that the amount of R2000.00 will be paid every monthend over the period of 6 month.hence im struggling to be paid last month money was in after i went to mfc.therefore now is the same im not yet paid..last week i spoke to Mr Martin Roux the owner of the dealership he agreed to make the payment before the end of today.when i try to call him he rejected my calls and reply with sms that he will call tomorrow in the morning 8 oclock.my views is that he must pay me the remaining balance in full by tomorrow then me and him we will be sorted.or els i will have to cpnsult the mfc for futher advise.their contact is 0121110006 and cell number is 0617656789.