Micromax Mobiles — About display lock

Address:

Moradabad, Uttar Pradesh, 244001

I have purchase a micromax canvas nito-2 on date 12 july 2015 by aarush world link, chaddha complex moradabad. There is an error in this mobile to lock & unlock to operate its function. I gave it to its service centre but they are cheating & forwarding to another. I am very mentally disturbed by this behaviour. Kindly solve my problem. ([protected])