Punjab National Bank Housing Finance [Pnbhfl] — About pre-closure letter

Address:

J.M road,Shivaji Nagar, pune

I have requested for Pre-Clauser letter from pnbhfl.its more than 35 days from my application date but still i have not received letter yet.
As per the bank rule and policy they will provide the letter in 21 days.
I have communicated them via phone, personal visit(By adjusting my office timmings)in bank and also alternate days I am taking the followup via email but not received any input from pnbhfl.