KYC Fraud By Bank In Delhi

A registered partnership firm had 2 partners. Majority my father and minority my mother. My father willed his majority shareholding to his elder son. In previous Partnership KYC, it was written "In the event of death of any partner, the firm will not close down, but be a continuing concern, and the legal heir of the dead partner can join the firm until he/she himself/herself refuses to join. We are 2 sons only. After my father's demise, my elder brother and mother secretly made a new partnership, quoting the previous Partnership Deed and the Unregistered WILL and didn't update the Bank. Though Probate is not necessary in Delhi, yet the Bank allowed continuation of the firm's operations before and after knowing about demise. Moreover, a loan was also ongoing from the same bank. When I informed the bank's legal cell, they suspended the firm's loan account