1) what are the clauses in your agreement for cancellation ?
i do hope that in your letter to builder you have mentioned at you had to cancel the agreement as there has been more than 75%deviation in flat as per BBMP approved plan
2) has builder given commitment in writing that he has no objection to cancellation of agreement and for refund . ?
3) if builder has not done so place on record the discussion you had with builder on _ date wherein builder agreed to cancel agreement and refund the Rs 30 lakhs paid by you
4) if builder does not refund within 15 days file complaint ebfore consumer forum for deficency in service and seek refund with interest .
5) also seek compensation for mental torture undergone by you