Very disappointed shopper!

I have shopped at Makro since they first opened, it used to be a great retailer. Service was always good, the staff were always friendly and helpful. However, since they were taken over by Walmart they have become the worst retailer on the African Continent. In September last year I purchased a Hisense gas stove from Macro, but sadly only 3 of the 4 burners work. The fourth has a defective component rendering it useless. After months of haggling and much shouting and screaming at Makro's so called customer services to get them to replace the defective component, yesterday I was contacted by Makro to say that they would give me a credit for the stove and replace it with a new one. But here's the catch; I need to get the old stove back to Makro to be able to collect the new one, and since I live in Howick and the Pietermaritzburg store is the closest to where I live, this will cost me approximately R500 for the round trip. Also, I will need to get a gas technician to come and install the new stove for me (legal requirement), this will cost another R500. Makro are expecting me to spend R1 000 of my money to fix their problem. As I am a Pensioner, I cannot afford to spend this money, so we have a stalemate. Makro get off scot free and I have to live with only having 3 burners working on my 4 burner stove. So ends my days of shopping at Makro.