SUMSUNG HILLCREST REPAIR POOR SERVICE NO COMMUNICATION NO HELP NOTHING

I purchased sumsung microwave last year February at OK furniture Sunnyside it has a warranty in less than 12 months the microwave stopped working I contacted the shop they organised a repair for me with sumsung hillcrest repair I took the microwave there with the recite they explained to me everything and tell me that if the is oil that causes the damage they won't fix, the next day I received the email the quotes me R1160 for repair they said and mentioned things they want to replace and claimed that ****roachs damage the microwave I asked the picture to see the ****roachs because I never seen them in the house they emphasise that the all Sunnyside, Arcadia and central there's ****roachs I told them I'm staying at centurion I just used that address because I used to stay there and the lady transferred me to the management he said I must send the email to negotiate my discount I did and never get response when I call after 5 days they tell me on the call after I made follow ups that they declined my request they are running a **** few clients at OK Furniture Sunnyside are having the same problems and for me to take it back without been fixed they are demanding R450 while is under warranty I need an help is been a month I miss my microwave please