Trai — not provided bill from airtel operator

Dear Sir Myself Sombhunath Mukherjee i'm not getting any bill from airtel company.They want to make payment immediate basic for my mobile number [protected] which is already port and i used other operator but from my previous operator they did't send on the last bill so i want my Bill for make payment.

My previous operator demand that make payment other wise your line was disconnected.But if i don't get the bill how i do the payment.
On this regarding i informed to there Customer care number but they can't provided the bill.

Kindly look into this matter closely.

Thanks & Regards
Sombhunath Mukherjee