NPA account holding with whom?

I want to know that if bank will declare someone account as NPA and account holder as Defaulter then is there any legal holding writes of NPA accout holder?

Explanation: if someone has bymistake transfer money to NPA account holder then Bank has to take concerned of NPA account holder for release of Money or Bank itself is authorized to release the Money? Amount transfered is still in NPA account not withdrawal by Defaulter..