Sony India — Heating of my brand new sony experia z5

Address:

700089

I bought my sony experia z5 a few days back but on the very first day o[censored]se, it stared to heat up and the battery drainage was also very fast. I went to the retailer regarding this problem and the response was not at all satisfactory they asked me to go and share this problem with any sony center. Experia being the flagship of sony was not expected to give such a bad performance. Now what should i do for this?