Aircel — my number got disconnected

Address:

Bangalore, Karnataka

I am using my aircel number [protected] from last 3 years. from past few weeks on words my number showing disconnected. I don't the reason behind that. but I can able to call to my contacts. but last two weeks on words I am not getting proper signal, not able cal and receive cal. please help me. This number is important for me. all my friends and family relatives having this number to contact with me. even I went aircel office near star bazar koramangala. they are saying that " problem with their end". they are not even trying for rectifying my problem. please provide my number ([protected]) portal code. I can switch to another network operator.