Poor customer Service

THREE WEEKS ago I took my Hisense microwave oven to the Carnival Mallbstore for repairs. The paint underneath the pkate is peeling off and it starts to rust. I continuously followed up and everytime I was told that they are waiting for the Hisense Rep to inspect and collect the item. When I asked to speak to the store manager I was told that she is off, or out of the office, or busy on the phone. The last time I spoke to Sydney (Sales Manager), Friday 29 Feb, he said the 21 days waiting period has not yet elapsed and if after 21 days it's not fixed theu have to replace it for me. When I contacted them today, Patience, at the service dept, told me that it is customer negligance and they will not fix it. When I contacted Hisense, they could not find and complain logged on my behalf with them.