IFB Industries — Not reparing even in warranty period

I purchased IFB microwave model 30BRC2 on 26.12.2020, it has 3 years of warrenty on the magnetron which is the main component that heats the food., I still got the warranty sticker intact. Now that I called the customer care that it isn't working they are saying that the warranty period is expired and 3 years warranty promise is only valid for magnetron and cavity. But how can they judge without even having look at the microwave. And the worst of all, the dealer who actually sold this tells me I have to contact a private repair person when they explicitly stated in their terms if I make any maintenance or repair by third party, my warranty is not valid!!