FastTrack — service for defective product

Address:

560097

I had brought a sun glasses in specsmart vidyaranyapura. That was a defective product. So when i went and asked for a replacement they charged me 50%. I feel this is injustice. So as per my knowledge i feel they should have given replacement
.. I have paid 50% of the money and also they didn't return my old specs. They didn't provide service uto the mark to my expectation.