Trai — post paid connection converted into fixed plan without knowledge and consent with me/us

Address:

Dhanbad, Jharkhand, 826001

I have been provided an airtel sim no [protected] by our department to use upto rs1000
I was/am using the same since last 3 years and was paying bill, sometimes rs.450/[protected] and so on according to uses.

But since last year airtel company is sending bill by fixing the fixed monthly rent, weather, i use rs 100 or whatever, or we may say weather you use or not fixed charges will have to pay rs1000.00

I have never allowed the airtel to make it fixed from post paid neither our department has done so.

I have send message/notice several time to airtel company to correct
The bill but no body is listing me and continuously sending bill for payments, there is a bill which is due from june 2017 amounting about rs7000/ out of rs.7000 only rs 100 is uses bill and rest are monthly rental.
I want to pay it and requesting to airtel co to send revised bill/actual uses bill so that i can clear it at once and also request it to discontinue the sim till settlement.

Airtel co. Is not responding and threatening me about legal action, there fore i request with trai authority to interference for solving the problem