Bank sent payment notice through advocate for not paying home loan EMI due to some authentic reasons

In the year 2014, I’ve taken a home loan from bank jointly with my wife (she is housewife) for purchasing an under constructed flat, which is situated at Greater Noida. From last few years back, unfortunately our builder totally stopped the construction. In that situation, buyers union filled a case against builder and now from last four years, it’s running at Supreme Court. Another of my Personal issue that from last October’2017, I don't have any job till date. I've lost my job last 2 years back due to lack of projects in my company. Now I'm living in a rented house at Kolkata. In this situation it is really not possible to pay loan interest every month along with my house rent. I've already consulted with a senior lawyer. She suggested me that immediately stop the home loan EMI and surrender the flat (which is mortgaged to Bank) for auction as per “SARFAISI Act". After that, I sent a email to bank manager and explained all this matter & requested him to takeover that under constructed flat for auction. I've stopped interest of loan EMI from May'2018. Recently bank send a Notice through a advocate for payment of interest and penalty within 7 days. Which is just impossible to me because of my unemployment. Please advise me my next step.