I bought a car in May 2011 (Ford Figo). The car is financed…

You have both those options under the Consumer Protection Act. Section 55 reads as follows:

56. Implied warranty of quality.—(1) In any transaction or agreement pertaining to the supply of goods to a consumer there is an implied provision that the producer or importer, the distributor and the retailer each warrant that the goods comply with the requirements and standards contemplated in section 55, except to the extent that those goods have been altered contrary to the instructions, or after leaving the control, of the producer or importer, a distributor or the retailer, as the case may be.
(2) Within six months after the delivery of any goods to a consumer, the consumer may return the goods to the supplier, without penalty and at the supplier’s risk and expense, if the goods fail to satisfy the requirements and standards contemplated in section 55, and the supplier must, at the direction of the consumer, either—
(a)repair or replace the failed, unsafe or defective goods; or
(b)refund to the consumer the price paid by the consumer, for the goods.
(3) If a supplier repairs any particular goods or any component of any such goods, and within three months after that repair, the failure, defect or unsafe feature has not been remedied, or a further failure, defect or unsafe feature is discovered, the supplier must—
(a)replace the goods; or
(b)refund to the consumer the price paid by the consumer for the goods.
(4) The implied warranty imposed by subsection (1), and the right to return goods set out in subsection (2), are each in addition to—
(a)any other implied warranty or condition imposed by the common law, this Act or any other public regulation; and
(b)any express warranty or condition stipulated by the producer or importer, distributor or retailer, as the case may be.

You just need to quote your preference to the dealer.

The fact that it is financed through MFC does mean that you will lose some money, which you can probably claim back through a claim for damages because of their misrepresentation. Fact is that if you bought the vehicle for R104 000, the dealership need to refund you R 104 000 if that is what you want. That you need to put towards the balance outstanding at MFC.