Airtel - Complaint Regarding my Airtel Postpaid Bill

I've several concern regarding my Airtel number. Firstly, internet doesn't work on my Airtel number from last several months and I am not even using services still my postpaid bill has reached to **** INR even my credit limit is ****.
I've registered several complaints about the internet issue, unnecessary charges issue etc. but no one has provided me any resolution. 
It's been a *  months I haven't paid my bill as because the internet wasn't working and I asked them to clear my bill (cause i wasn't able to use internet) so that I can port out to another network but no one provided me any resolution then i though my services will be barred after *-* months of due bill but they didn't barred my number and they continue putting charges every month even i wasn't using it. Now, i want to port out to any other network and I am asking them to clear the unnecessary charges so that I can pay the valid amount and port out but they're saying I've to pay the whole amount why? I haven't using their services then why would i pay the whole amount? even if the credit limit is **** then how they can bill my number to ****? 
I've even contacted with the nodel officer but they're saying the same thing that I've to pay the whole amount.
Now I am asking to, disconnect my services until they clear my unnecessary charges on my bill. Once they clear my unnecessary charges and tell me the final amount I can pay and continue or else.
As I've raise complaint several time on Airtel support but no one provided me any resolution so am not sure where to register my complaint further.