Hifi Corp - Broken fridge, broken promise

In 2018 we bought items to the value of R15000.00 cash at the store, a Hisense fridge, Defy gas stove and a Univa chest freezer. About a month ago the Hisense fridge started giving us problems, whereby the drainage hole at the back of the fridge was not channeling the water to the drip tray at the bottom back of the fridge, in addition, the fridge is over frosted right above the first freezer tray, so much that we cannot close the door properly, which means if we buy meat and frozen items, it will go off as the door cannot close, keeping the items frozen. We called Hisense, a Technician came out and advised that the fridge cannot be fixed, Hifi Corp needs to refund us and replace the fridge with a new exact same model. When we got to Hifi Corp on Sunday 12 July 2020, our details were taken by the floor staff and said we will be contacted that coming week. No one called us so we decided to go back to the store Saturday 18 July 2020 and hear for ourselves what the progress was. We were advised that the fridge is discontinued so we wont be able to get our exact same fridge, we can get the credit of R6999, that we paid for the fridge and choose another fridge that is on the floor, but we will need to pay R450 for delivery of the new fridge and collection of the old one. They showed us a Defy 348L black fridge that was R500 more than ours but smaller in size. This was info that the sales lady gave us, the manager, Danie, did not even bother to ask us what the problem is or give us a better solution. According to the sales staff, he in general does not listen to the clients that come with an issue, and gives the worst possible options just to get the client out of the store, we are not the first unhappy customers. Why do I need to pay for delivery and collection if my item is still under warranty, why does Hifi Corp offer me a smaller fridge at a higher price than what I paid for and still expect me to pay an extra R500. These items were bought cash and we asked for free delivery since it was a cash sale, now you want to make up delivery/collection costs. We then contacted Hisense warehouse, and they confirmed that they have this specific fridge still available for purchase. We have been misled with incorrect information and the staff or manager probably thought we would not bother to do our own investigation. Would it really be worthwhile to lose even more clients during this time where all stores actually need the sales? Would you really have a manager that drives people away from the store, instead of giving good customer service to get more valued clients? We are now sitting with a problematic fridge and no real options. However, i will tell you what my options are if i don't get refunded the fridge i bought, i will take this matter further with the consumer Ombutsman, you will not ignore us and hope we go away silently.