Airtel - Network issue for calling simultaneously 4G internet speed too

I had to get recharged with ***+**=*** INR to receive fast internet *G speed but yet not speed improved whereas I have added on the pack is also recharged even Still doesn't affect, even I have complained in *** customer care service. He was being replied that after four hours our networking service will be improved. This been saying for the last three to four days. Literally, I am very much disappointed because today he was told me that you can also switch off your mobile and try. Even after doing all this, nothing affected the speed. Please resolve the issue.