1. Always Settle With the Bank and not with collection agent.
2. Go negotiate with the Bank and ask them for a deal. Their are two things in this again,
2.a - Account Closed - Full and final Settlement Done at less than 2 Lakh - CIBIL Report Status will not change - You will continue to be known as Defaulter.
2.b - Account Closed - Full and final Settlement - Rs 2 Lakh Paid. CIBIL Report Status will change. [DEMAND for it, if you want to Pay 2 Lakh]
The thing is you have neglected for 4 long years, so it is difficult to establish Good Faith of Payment from your end when you appeal. Depending on your situation and further Loan Requirements, go ahead with whatever settlement that best suits you.