who was sending those sms?

in the last episode who was the "zakhmee aurat" who kept sending disturbing sms to ajay...i am bit confused. someone explain it to me.

those sms were being sent by Zubin and Boxer - they said so in the last scene, when Zubin came in after a photo exhibition, where the first prize had gone to a picture of an injured woman - a "zakhmi aurat"...so when Ajay heard Zubin mention the phrase, he knew, and then Zubin exchanged glances with Boxer and said - "lekin humne kya kiya?" and then Ajay called them both Zakhmi aurat Part 1 and 2!