Sony India — sony not delivering replacement for smart watch in warranty period

Address:

Ernakulam, Kerala, 683112

I bought a smart watch on 2nd oct 2016 from sony and the product became not working within the warranty period. I gave it to a sony service center on 15 may 2017 and they told that they would replace the product in two weeks. After a month when i reached out to them they told they are not able to find a replacement for my watch as the model is discontinued. I escalated this case to sony and got reply from them that they will work on it asap. Again after three months i got a call from sony saying that i bought the product from a non registered dealer even though the product is genuine, so i will not be eligible for replacement.

I understand that this is a way adopted by sony to defend my case in case i file a legal suit. What needs to be done next?