HiFi Corp

I bought a Samsung 32lt Electronic Microwave Silver ME9114S1 in they online store (last year on the 07 June 2019) then on the 15 May 2020 I took in to Mitchells Plain for repair as it was not warming food and still under warranty. they told me it will take 2 to 21 days to be fixed and they will call me. They never called, then I went to the store on the 31 July 2020 they told my "microwave is ****roach infested.This is not a manufacture defect,therefore the warranty is void" and showed me picture of the inside (which I have no proof if those pictures are for my microwave). I logged a complain (ref no: ***) and they told me someone from the shop will call me in the next 24 hours so that I can come and get new Microwave they never called, I then called them on the 13th August 2020 they told me they can not help me my microwave is been void. please assist this is not a good customer service