Airtel - Postpaid Number Tariff Changed without customers permission

I went to airtel office branch located in Dharapuram road, Tirupur, Tamilnadu and i met the branch head Mr.Suman raj and requested to provide me two more postpaid number for my airtel account. He told the monthly plan tariff will be changed as ****/- from previous *** plan. He taken my Aadhar card copies and * numbers of my passport size photos. I given my phone to Mr.Suman Raj of the Airte office. He have changed the tariff without my permission and given me two blank sim card and told me that these two number will be activated in ** hours. But nothing happened. Only my tariff bill rate has changed as ****/-. I have talked to the customer care and they said to go again to request with Mr.Suman Raj of the Dharapuram road Tirupur Airtel office. I went there and told all the issues, i requested to return back my aadhar card and my photos. but he said this is corporate company, we can't give back anything to anyone for any reasons. Also i can't do anything so you should pay the available bill.
Such a worst Airtel company cheating every customers in different methods keeping their branch office and fraud employees.