MUTATION OF PROPERTY AFTER DEATH OF ONE HOLDER

MY FATHER AND MOTHER JOINTLY HOLD A PLOT OF 2 KATHAS UNDER KALYANI MUNICIPALITY, WEST BENGAL. MY FATHER DIED ON DECEMBER 2006. TILL NOW ALL PROPERTY TAX PAID IN TIME.I AM THE ONLY SON AND THREE SISTERS. PRESENTLY ALL MY SISTERS ARE MARRIED AND LIVING IN SEPARATE TOWNS. I ALONG WITH MY MOTHER STAYING IN THAT PLOT. IN FEBRUARY 2020 I HAVE TRANSFERED THE PLOT IN MY NAME THROUGH GIFT DEED REGISTRATION, 01 KATHA FROM MY MOTHER AND REMAINING 01 KATHA FROM MY MOTHER AND SISTERS. I HAVE APPLIED FOR MUTATION OF PROPERTY IN LOCAL MUNICIPALTY BUT THEY RETURNED THE APPLICATION SAYING AFTER THE DEATH OF FATHER WE ALL LEGAL HEIRS SHOULD HAVE DONE DEATH MUTATION OF THAT PROPERTY. WITHOUT DEATH MUTATION WE ARE NOT LEGAL HEIRS OF THAT PROPERTY. SO GIFT DEED REGISTRATION IS LEGALLY INVALID. PLEASE SUGGEST ME THE LEGAL OPTIONS.