Airtel — 4g service issue (Worst service ever)

Hi,

I have ported from Docomo to Airtel on 1st of this month to my plan infinity 1999 and i had an issue while porting. The outgoing calls where working, where as my incoming calls and SMS service also was not working. They took one and half week to solve the issues after escalating almost every day and changing sim 3 times. finally after one and half week it got resolved but with another issue. 4G services were not working on my sim. I went to the store and tried there test sims by putting it into my phone and 4G Was working on my phone, which proves that the problem is not in phone. after sitting in Airtel store (Panjaguta, Hyderabad) for more the 2 hrs, they said its issue in profile. It says 4G Services not defined on my profile (I don't know how). They said it will take two days to solve the issue.
Its been more than a week and still they are still unable to solve the issue even after they know what the issue is. they said they escalated the issue to highest level. Still there is no response from there team and when ever i call the customer care or the store manager, they say it will take one day or 2 days. But it has not been solved till now. I dont know why i should pay the bill (2000/-) for an incomplete plan activation. I tried following up with them in the every possible way but nothing is happening. They have changed 5 sims till now and nothing happened. Now the problem is they are neither letting me port out of Airtel (can not port within three months) nor giving me proper services. I dont want to pay the bill of this month for such a bad service. I want to know if there is any other way i can get this problem solved? what is the highest level of Airtel customer service team i can reach and talk to and how do i do it?

(PS : This is the worst customer service i have seen by far. Even reliance does better)