Lenovo — The phone is in warranty period and yet not repairing

Address:

Jaipur, Rajasthan, 302019

I have given my phone in service center on 10/01/217 in Jaipur and on 19/01/2017 I asked them about my phone. They said that approval is not granted regarding Warranty and your phone will be repaired and charges will be borne by the owner. They also took the original invoice from me. I want my phone to be repaired in warranty as soon as possible as the service center has already delayed in repairing the phone