Notarised power of attorney of 1985 used for agreement for sale in1993& in 2022for conveyance deed

Sir we (Call us party A) had purchased a Building through Voluntary Liquidiation Auction vide conveyance deed in November 2022 from Government promoted and bank promoted organisation (Call it Party B).... this party had purchased under construction building along with land vide agreement for sale in april 1993 and they got possession of building vide OC in november 1993.... Party B urchased it from Builder (call it Party C) who had signed this agreement for sale; firstly on behalf of him self as a builder or developer and secondly on behal of land owner (Call it Party D) vide notarised power of attorney and unregistered development agreement; both made in september 1985.... this land owner had purchased this plot of land vide registered agreement in 1975.... but had done property card mutation in 1992 only... so property card have name of Party D as on today.... Now Party B want to sell this building through Voluntary Liquidiation Auction in 2020 ... so they approached builder Party C for conveyance deed.... which builder complied and had executed registered conveyance deed in march 2022 in favour of Party B by signing this conveyance deed as himself ie. Builder developer and as a land owner using notarised power of attorney of 1985..... Now Party B sells this building and land through 2nd successful Auction in november 2023 to Party A ie. Myself... First Auction was unsuccessful.... during both the auction paper notices were Published and all due diligence were followed.... After getting conveyance deed we successfully got property tax receipt in our billing name from BMC.... and we had also applied for Property Card Mutation at City Survey Office on our own... but they had rejected our application repeatedly (total 3 times) citing reason that Party B got conveyance deed from Party C ie builder using unregistered but notarised power of attorney and there is amendment in act in 2010 applicable from 2013..... so they can't mutate property card firstly in name of Party B and then in our name..... I find this reason absurd as builder had already used this POA in 1993 and promised to give building constructed on plot and conveyance of plot vide 1993 agreement of Sale.... in 2022 vide conveyance deed he is just fulfilling that promise.... so applying 2010 POA amendment retrospectively is bad in law.... beside there are other arguments also Please advice.... we want to reply in a proper legal manner by taking your service.... so please give ur email id... contact number for further discussion..... Thanks regards Dr. Shailesh Patel