Can the below case be handled legally? what is the advise?

We are a family of 3 residing in Bangalore. We purchased a property from Godrej, in Bangalore outskirts. The property is a Townhome or Rowhouse in a gated community. we booked it in July 2018 and the construction got over by November 2019, though the promised date was Dec 2018. When the builder showed us the Khatha, it said ápartment instead of Townhome. We raised an issue and requested them to correct it. however, godrej maintained that it is alright to have the khatha as Apartment. We were not ready with this compromise as Khatha is a revenue record. We have not gone ahead with the registration and posession as we want to have these records to be corrected. Godrej team is adamant in spite of many email communications and escalations. They agreed to correct the khatha after registration, which we feel they may not do it at all if not now. We feel cheated. We want to send them a notice to act on this. Till today, we do not have a home. we are paying house rentals, bank loans, etc...