Airtel — network problem!! my number rarely connect.

Address:

Haridwar, Uttarakhand, 247667

I’m using iphone 7 with airtel 4g sim. I have an issue regarding incoming calls as well as outgoing calls. If someone tries to call me it always comes unavailable or out of reach. After 3-4 tries, call rarely connect. But if i change my phone settings to 3g than this issue somewhat reduce but with 3g settings, net hardly works. I have reported this issue to customer care also but they sometimes say network upgrading is going on sometimes recommend to change my sim. Airtel store said it’s a network issue. Please look to my issue else i have to port my number. Thank you