Punjab National Bank [PNB] — How to change phone number in punjab national bank account

Address:

Chennai, Tamil Nadu, 603203

Dear sir,
I am submit mobile no. Change application dated-05/10/2016 in my home branch. But i did not get any response. Sir my home branch address is pnb-branch office 156 l. C. Street, chennai -600001
Account no.-[protected]
Name - lakshmanan
Ifsc-punb0361100
Old no is - [protected] (Lost)
New no is-[protected]
Ir please take necessary action.
Thank you.