Lenovo — Mobile phone faulty not replaced within one week of purchase

Address:

Mumbai City, Maharashtra, 400028

I had purchased mobile phone on 27th may 2017 and started facing software problems and submitted to service centre within one week they checked twice and kept for checking on 2nd for 48 hours checking and confirmed device is faulty on 5th but i was on holiday and returned on 11th june 2017 they asked me to return box which i did on 12th june 2017 now on 14th they say it can't be replaced. If i do not get replacement i am planning to go to consumer court