MAKRO DOES not DELIVER ON AFTER SALES SERVICE

I bought a Sunbeam 5 burner gas stove in November 2014 but had only installed it on 2nd October of this year. At installation by a certified gas installer, the tecnhician in my presence proceeded to test each burner. At this point it was identified that one of the burners does not work. Whilst the stove is still under the purchase or manufacture's warranty, I logged the problem with Makro Springfield on the 2nd October 2015 and was told by the Makro staff member that my query will be serviced within 48 hours. To cut a long story short, lots have transpired between the 2nd October to the 24th October. and too date my problem has not been resolved. I am very disappointed firstly with the service I received from Makro, from the salesperson who sold me the stove to the returns manager who does not return calls and neither does she keep you updated with the progress of the query. I am also very confused that Makro can stock an item such as Sunbeam and do not have the expertise to support the product and I can substantiate this statement. I also will recommend that nobody should purchase a Sunbeam gas stove. Sunbeam themselves have not yet been able to resolve my problem.