HTC India — Back camera issue

Address:	492001
Website:	WWW.HTCINDIA.IN

Dear sir,
I have purchased HTC 826 on 8/11/15 so my phone in warranty . I have back camera issue bcoz its too blurring when I capture any picture its look like old picture means shattered image but front camera is working very good. I went too many times to your service center and I told to your service engg. about my back camera issue but he is not ready to understand my problem and he also told me we can not repair your phone when my problem as it is .Really I had too bed experience with htc service center after that I realised. So tell me what should I do ? If htc will not resolve my problem then i would have to go to consumer forum against HTC bcoz I have no option for that.
I heartily request to you please do the need full