Bharti Airtel — 4g network issue

From 18 october i can't used 4g service in my location. But last six months i have used 4g service in same locations at great speed.in my plan i have received daily 1.4 gb data. Now last three days i have not used this. 4g network is showing and display connected but not working or load any webpages. I have been call them lot's of times but they did not take it seriously. I hope now they will be solve my issue. My mobile no -[protected]. I also request airtel to if they can't solve my issue they refund my last recharge amount i will port my no to other network. If i port it now i have lost. Because 580 inr in my main balance. Thank you...