1) dont bow down to threats . if recovery agents are harassing you wife record the threats
2) send letter to bank MD pointing out threats received from agents .
3) if no action is taken by bank lodge police complaint against bank , recovery agents .
4) at most bank can file summary suit to recover its dues .
5) if any one from police station calls up ask their name , designation . inform them that it is a civil dispute and not to call up again or you will lodge complaint with police commissioner against said officer