Panasonic — side by side refrigerator

I have taken refrigerator now after 2 years it was not working first it was not getting cool and I have complained it in your service centre.but after 2 days he came and then he told me.sensor problem is there and he will bring it now it is one month and there is no response and now my fridge is become very noisy and ice was forming in refrigerator and it is not defrosting repeatedly calling to your customers care centre there are not sending any technician .I am fed up with this I am from Bangalore please look into this matter.