Sony India — Noise cancelling digital mdr-10rnc

I had purchased NOISE CANCELLING HEAD PHONE MDR-10RNC from this Sony outlet in Palladium called SIDHANSH ELECTRONICS PVT LTD. I had told them at time of purchase I need for my son who is giving board exams and will be using only on Jan to March as we stay in sewri which is very noisy.
I purchased on 2nd January and they stopped working within 10 days. I went back to the shop as they are under warranty but he refused to get them repaired and told me to take to service centre.
I gave them at your service center ORBITZ ELECTRONICS AT WORLI . I was told it will be repaired or exchanged within a week but now they say no revert from your head office.
I have spend 15000 just to use for 3 months out of which 1 is over in this.
For a brand like Sony to not revert under warranty is a shame.please refund my money or repair the same as i seem to be just going in rounds.
attached is invoice image (3821/14-15/p) and repair invoice image.(job no J[protected]