Microwave Oven not repaired

My microwave (Sharp) was taken for repairs on the 24 Nov 2015 and to date not repaired. It is covered by a maintenance plan with Mastercare. No feedback was ever given. I called numerous times and delivery was promised but not informing me that they were not prepared to fix it. My last call on Wednesday 13/01/2016. I was told by the agent of Mastercare that he will deliver the item without repairing as he was told that it is too expensive to repair. I find this unacceptable as I have been paying religiously towards the maintenance plan.