Car dealer Wingfield Goodwood

I am in situation that this company that I mentioned above apply the finance for me while I was buying car,Car that I did not drive first week gave me problem they took back when they look the car had problem with Engen ,2nd car mix water with oil I took back they say it was gasket 3time now they say car has gear box problem since I have been paying Absa bank full installation for more than six month I have never drive my Husband car I need someone to intervene in this issue before I loose my temper we visit them almost once o twice in week they promise my husband that they will borrow him another VW polo car for the time being till now he don't have car