Airtel — mobile 4g internet is very slow

Address:

560078

I am suffering from last 2 to 3 months that my airtel internet is very slow in the evening time and i had complaint many times that this is the issue when ever i call customer care they simply say that we are taking complaint about the issue then next day morning i will get a text message saying that your issue has been resolved
They will just ask the area where i have problem, i live in banashankari temple ward umarbagh layout bangalore 560078

Many times o approached airtel outlet but they will just skip and they ignore
I am using iphone 6s plus

This month i recharged 399 for 84 days validity and per day 1 gb
When i check the speed in evening download will be 0.22mbps upload will be 0.02 where in the morning i will get 12mbps

Could you look in to this resolve as soon as possible