Hi
You should send notice to the builder demanding the competition of the amenities promised and also ask for compensation for delay.
Did the agreement says about he compensation if delayed what is this Rs. 7/sq.ft as compensation for delayed months in handing over. You can also for the interest or the amount
for the flat separately there is no katha, it is of the land beneath the building , you can ask the builder to transfer it in the name of the association of the members / Apartment owners association.
The builder has to register it as a society and hand over the possession if he is not doing the members or owners of all flats can form it and register it under Karnataka Apartment Ownership Act1972, or Karnataka ownership Flat act.
You should also demand for the minor work which are pending.
If the demands are not met approach the consumer forum and seek compensation against the builder for all the mentioned relief and mental agony