Mi India — Defective product received

Address:	Mumbai City, Maharashtra, 401101
Website:	www.mi.com/in

I received redmi note 3 (32gb, gold) on 19th aug 2016 against order
#[protected].
The nature of defect:
1. Faulty sim card tray system : not opening at all
2. Scratches on screen protection

After lodging the complaint and request for replacement, its been four days of my continuous follow up with the customer service representatives of mi - india.
None of them gave a proper feedback to me and neither they accepted my request for replacement. They say contact nearest service centre and when i communicated with their service centre, they tell me to contact the online toll number
So where shall i go?? If their own executives contradict each other

I have wasted my time, money efforts everything on them but all in vain.

Any the biggest lie written on their website is 'hassle-free replacement'
Haha xd.