Kenstar — micro oven not working for more than a year

I have bought the micro oven in dec 2015, it got failed with in 6 month o[censored]sage. I have made many complaints, still the problem is not fixed.in between many people changed in kenstar, every time i need to explain the issue to new employee and this is keep going. The latest complaint number is che[protected], now they are telling, they need the spares.