Sony Xperia India — sony xperia mobile g3416xa1 plus gold

Address:

Hyderabad, Andhra Pradesh, 500004

I bought the sony mobile xperia g3416xa1 plus gold for rs 19, 990 from bajaj electronics, banjara hills, hyderabad, telenga on 23/05/18
After just a couple of days the phone started hanging/freezing. I could not make calls or use the phone without it hanging every few mins.
Since phone was in warranty i took to a registered sony service centre, they said it was a software problem and wanted to upload the software again assuring me that it would work fine after that.
But the phone started hanging /freezing after just a few days o[censored]sing it. The second time i took it back to the service centre they said they did not know how to solve the problem.
I demand sony take action or supply me with a new phone. Selling a defective phone is not done as this amounts to cheating. It's just been two months since i purchased this phone and have been having this issue with it everyday.
Thanks