Airtel — close airtel payments bank

On 12 september 2017, i visited airtel store, kopergaon, ahamadnagar to link aadhar number to my mobile [protected]. There i got registered with my aadhar no and thumb impression. I got message aadhar link will be done in 48 hrs & informed by sms. But additionally without my permission they activated airtel payment bank account. I got sms about that. I called customer care 121. He said he can't close account. He told me to call on 400. I called on the no. But is asking me for mpin change and no person to talk there.
I am requesting please deactive my airtel payment bank account