Xiaomi — Xiaomi mi 4i phone, blank display, given for repairing

Address:	Kolkata, West Bengal, 700014
Website:	www.mi.com/in

I bought my Mi4i (32GB) (Serial/IMEI no.1 : [protected]) phone on 19th Aug'15. Suddenly, on 10th Dec'15, my phone got some display problem (blank display). So, I submitted my phone in the Mi Authorized Service Center (Infotel Services, 1A, Andul Raj Road, Hajra, Kol-26; Email- infotel.[protected]@gmail.com ; Contact No: [protected]). They delayed the service date & delivered me on 24th dec'15. Then I noticed, they changed my phone's configuration into lower version without any notification. As I feel that I'm deceived by the service. I did not accept the product on 24th dec. Till date I did not receive my phone, and to add to my harassment they dont even bother to attend my calls. Please look into the matter and help me out of this problem at the earliest.