In regards with a flat I have bought in Ahmedabad.

Dear sir/madam, I would be very grateful if you could answer my queries at the bottom. Thank you. In Ahmedabad, a flat in a 2-floor scheme was bought for 60 lakh for which a file was given (allotment letter and receipt of a cheque). In February 2012, the flat was purchased with a verbal promise of possession in March 2013 by the builder. The builder has declared 30 lakh rupees as a loan from us in his income tax return. The builder has given me a flat file on one hand and declared it as a loan on the other. Is that legal? The builder (against our wish) extended the flat scheme to 7 floors. After a settlement on July 2017 with the builder, the builder then proceeded to give us a flat in the 7 floor scheme with possession in September 2018 and exchanged the file of the old flat for the new one. The new flat's AMC, AEC, Legal, Maintenance deposit, maintenance expense and taxes are liable on me. The taxes have to be paid on 90 lakhs as that is the sum that the jantri estimates in that particular area. Could you let me know the answers to the following questions: Who is responsible for paying for this additional tax on 90 lakhs instead of 60 lakhs? What documents does he have to provide in relation to this? When will the maintenance cost start, when the possession is handed over or when the BU Permission has passed? If not using the flat after possession, what should the maintenance expense be (other members will use the loading area but our built-up area won't be used)? Regards, Hemant Pandya