Dissapointing and possibly iilegal no exchange policy

Makro is a very well established retailer in South Africa. Disappointingly, this has not stopped them from engaging in anti-consumer business practices. I ordered a couch from the Makro online store at a discount. Makro then delivered the wrong couch. I informed them of this as soon as I found out. The customer support agents told me that I need to log a return to receive a refund. I informed them that this is not a sufficient remedy as it does not allow me to benefit from the original deal that was advertised to me. The customer support told me to just log a return and pay the difference to order the same couch again (which was now R 6000.00 more). This is absurd. You can certainly get a good deal from the Makro online store but there is no guarantee that you will receive the item you ordered and there is certainly no guarantee that Makro will offer a sufficient remedy.