Idea Cellular — Incoming outgoing calls not working

Address:	Mumbai City, Maharashtra, 400709
Website:	www.ideacellular.com

I have full network in my phone but when I try to call anyone I am not able to call same problem coming for incoming calls also when anyone wants to call me. they will got either engage tone or phone out of coverage area voice. and sometime phone is switched off but my phone is neither switched off nor out of coverage area. this problem is coming from monday morning morning and still is not resolved