iBall — service denied at service center kolkata

Address:	Kolkata, West Bengal, 700015
Website:	www.iball.co.in

I would like to inform, that today I was denied service at an Iball Service Center located at Central Avenue Kokata. They said that the laptop which I bought through Amazon from Dealer named EXIGO IT INC, BANGALORE is not an authorized seller of Iball Company so they won't provide me free service which I should get as my laptop is under warranty period. To repair the laptop, out of that I have to provide them 9k approx for repair and servicing.
When I called Amazon, their executive told me that I have to send a service denial email from Iball Comapany mentioning that EXIGO IT INC is not an authorised dealer of iball and thats why I was denied service. From that very moment, I first requested the service center for the service denial letter, but they said they can't do that kindly contact customer care or log into the website www.iball.co.in. So I did that too, the executive on all said that they can't do that, I have to send an email requesting for service denial letter. I did that too, and still no reply from Iball. I want to raise one question how would that how can an unauthorized seller sell and iball laptop??? Companies should inform that they would only service products from authorised dealers, Why don't they do so? Kindly look into this matter and inform me what suitable thing to do next. I am attaching the purchase invoice provided from the dealer with this