Huf bank operation on the demise of karta

Ravi (Self Employed) (65 Points)

04 March 2017  
Hi My father had opened an HUF bank account with one of the nationalised bank. Lately he passed away & I approached the bank branch manager to make the karta so I can operate the account. This gentlemen refused that the HUF needs to be closed & cant be operated anymore. Father (karta of the HUF) Mother - coparcener Sister - coparcener ( elder & married) Son - coparcener (major but younger to sister) In my case who can become the karta. How should I make the branch manager understand that HUF account can be operated even after the death of karta. Which competent authority should I approach. Please advise & guide. Thank you.