Airtel — No network for a long time in a day.

Dear sir... i like to inform u that i am using galaxy note 2 but my phone there is no network each n everyday since long time. That's why I can't do my work in net. For this reason i have call yesterday but the executive attend da call and after few minutes he disconnected da line without Listening to me.. So request to u please solve the problem as early otherwise i will port da no. My no is [protected] Thanking you .