Lava Mobiles — Invalid imei in this mobile

Address:	Rajkot, Gujarat, 360007
Website:	website of lava mobiles

As i want to tell you that the this invalid imei - simcard showing for more than 2 months and if i keep my simcard on other phone it works properly but in my phone only internet connection works it shows me emergency calls only no incoming and outgoing calls or messages is coming. On other website it shows the solution of invalid imei that download this application and put your imei number and reboot your device i have tried this many times but still it is not showing me the signal of any network what can i do now. So please give me the solution of this problem now it's emergency so please show me the solution now