Airtel — number is blocked

Address:

New Delhi, Delhi

i got a call from airtel regarding the change of plan from postpaid to prepaid on 12/09/2014 i liked the plan and i deposited the documents to the executive who came to my office to collect the documents. the next day my no got blocked. its being 4 days now, they dont have any details of my number. i called the helpline no humderds of times but they people put my call on hold. plz do something asap