Airtel — 4g network working on 3g and internet on 4g is also not working

Address:

Mumbai City, Maharashtra, 400068

I am using an iphone i have recharged my airtel no with 399 pack postpaid and my net is not working properly it’s continuously showing 3g network but net is not accessible and whenever it shows 4g network still the net is not accessible and i am facing this issue almost every month kindly look into the matter and let me know the solution or else i am thinking to port it to some other network