Sony India — Improper function of mobile handset

I purchased brand new sony xperia z5 premium from Adarsh Bansal Sales, Ambikapur, Chhattisgarh details given below:

1) Purchase date 13.12.2015 for amount rs. 56500 /-
2) IMEI- [protected].
3) IMEI 2- [protected].
4) TIN NO.- [protected] is of the shop.
5) Bill NO. - ABS/007 dt.[protected]

After 6 days o[censored]sage I started noticing hearing defect and no voice transfer clarity. Immediately on 19.12.2015 I gave it to authorized service centre in Ambikapur details given below

1) Ticket id- [protected]
2) Job no.- w[protected]

Despite regular follow ups from service centre and toll free nos. I am not getting any response till now. As service centre communicated the set shall only be replaced and not repaired. Further they are not accepting any mistake in handset inspite of giving live example to concerned official of service centre. I demanded for replacement as it is manufacturing defect or arrange full refund to me immediately. In the matter I wrote mail to sony customer care which was logged through number 29863399, still waiting for the response from the sony officials to take action on it.

Please advice in the matter.

Akhilesh Mishra