Airtel — fraudery in airtel office motihari

Address:

845401

I am a resident of motihari and airtel user for past 5 yrs.
Presently there is single airtel office in motihari and they are enjoying monopoly in this region.
The ugradation of sim cards from 3g to 4g according to details i got from customer care are free for 4g enabled locations and rs. 25 for non-airtel 4g locations.
But here airtel store (Nirmal prem communications) in saran complex motihari are openly cheating the public and charging rs. 50 per upgradation.
I have also been charged and on asking for reciept they provide none. Nor do they provide their complaint book or any written means. You can cross-check my complaints by contacting people who have upgraded from here in recent past

It is a serious offence and i kindly request you to take action against the offenders.
I am ready to be witness or whatever are required for taking action against them.
Contact no [protected]