Airtel — unstable 3g, 4g network

Address:

Madhubani, Bihar, 847231

Dear sir, your airtel cellular network is the most used mobile network in my locality, but there is no 4g upgrade and most of all 3g network is so unstable and annoying... So please upgrade your network here or least of it fix the 3g network... Hopefully this complaint reaches you....
Please resolve the issue otherwise i will port my airtel number to other provider

Thanks