Land registered without Chakbandhi - how to obtain separate Survey Number

The land with survey number abcd/e amount to 6 acres was owned by 5 parties of the same family (A,B,C,D,E). Four out of the five family members, out of the rightful share of the property (i.e. 4/5th of 6 acres) sold 1.5 acres to the party F in September 2018. This registration did not have a chakbandhi except for road access (there is only one road -panchayat owned - to access the property) In january 2019 Party F registered this 1.5 acres to party G In August 2019 I purchased this property from party G without chakbandhi When asked for the Taluk surveyor to allocate a separate Survey number, I was asked to get chakbandhi correction added on the registration document which the SRO refused to entertain asking me get a separate Survey number before allowing the correction. Chicken and egg. Currently, I own and enjoy 1.5 acres out of the 6 acres along with A, B, C, D and E. This 1.5 acre is fenced the VAO has certified this to be owned by me. What are the legal ways for me to get a separate Survey Number? Asking the family to do property division is not an option. The property is Agricultural with no other known encumbrances.