Home loan account - npa

I had purchased the apartment in June 2017 and it was under construction property. As per the sale of agreement the possession date is December 2017 with grace period of 6 months. I had promised by builder that my pre EMIs will be taken care by builder for a period of 18 months, but while releasing the loan amount to builder the bank people have taken 2 lakhs as pre emi which was sufficient till 10 months period. Post 10 months bank people are calling me and asking me to pay the EMIs which i had denied since the builder had stopped the construction because of not having funds. I had sent a notice to builder and bank people stating the same. I had also sent an cancellation request to builder stating that i dont want to continue since its been delayed. Now my loan account is put into NPA, and i have approached RERA hearing are ongoing. Can you please suggest how to come of this situation. Firstly i want to cancel the agreement and secondly i want the loan to be cleared by builder so that i will get NOC from bank. As my home loan is into NPA, im unable to get any loans. Any suggestions are welcome.