Sony India — Sony Xperia Z3 mobile problems detected twice in brand new handset

Address:

Solan, Himachal Pradesh

I have purchased Sony Xperia Z3 cellphone on 27 Jan 2015 from chandigarh sec 22. On 7th Feb 2015 screen got blackout n stopped working. I submitted handset at Sony Centre sec 47c chandigarh n asked them for exchange of handset with new handset but they denied n said that this handset will undergo repair. Repaired the brand new handset n returned me on 14th Feb. 2015. Now recently another problem has occured now Mic problem has occurred. Voice to the other person is not clearly audible. So plzzzz help me out to replace this handset or refund me money.. I have wasted rs 44000 on useless device. Please revert on top priority.