Sony India — negligence in after sales service

I bought a sony r1plus mobile, it has a faulter on and off switch. I went my nearest service centre to serampore, west bengal for service. I handed my phone to them and they assured me to replacement within 1 week. But 30 days passed but i didn't get no reply.in the mean time i discussed many of your customer support. But it seems in vain. I didn't expect such an worst support from sony like brand. Am waiting for 2 days more if the issue is not going to solve i will drag this issue to civil consumer court asap. There we can discuss whatever we need. I'm giving the paper details which i got from service center:

Doa: d[protected]
Gstid. 19aabcn0367m1z6
Sla[protected]