Cancellation of the Flat and closing the bank loan

I have bought a property in the year of 2014 in Noida Sec-143A. My payment plan was 40:60 and i paid the 40% (through bank loan + self fiance) but due to some unforeseen circumstances now i am unable to hold the property and pay the EMI of 40% payment. I have been chasing the builder to cancel the flat and refund the amount so that i can close the bank loan. Builder is saying we will levy 10% cancellation fee, which is there in the contract and builder have made an advance service fee on my behalf to the Gov of Noida so that will also be deducted. I have requested the builder to waive off the fee and close the bank loan directly, they are saying that we have presented your case to the management but no approval yet. I want advice/help to understand this and want builder to waive off the cancellation fee not full then some amount and close the bank loan ASAP as I am unable to pay the EMI. I was regular to bank for last 3 years and now not giving EMI from past 3 months. I need help to close this ASAP.