AIRTEL DIGITAL TV - Airtle Digital Tv is not functioning well

Dear Sir,

I have purchase Airtel Digital Tv. After use of 1.5 - 1.7 year, it's not functioning now.
I complained 2-3 times to the department to check and correct that, they replied that you need to pay 400 - 600 Rs and we will change that. After 1.5 years this is the natural problem.

Now, My issue here is that the industry standard for such big company like Airtel ? can't they develop the electronic gadget which work at least 3-4 years without an issue ? even they don't have time to check and their department know the issue very well that's why they instruct us to change without checking even.

This is not the issue with me only. even here my 2-3 friends with the same around 1.7 years have same issue with and same answer from company.