The pilot did not use his callsign with his readbacks.
https://flightaware.com/live/flight/KAC117/history/20190504/0605Z/OKBK/KJFKTranscript
Tower: Kuwait 117 Heavy, do you have the traffic short final in sight?
KU117: Affirm
Tower: Kuwait 117 Heavy, maintain visual separation with traffic.
KU117: Will do
Tower: Kuwait 117 Heavy, confirm maintain visual separation.
KU117: Confirm
Tower: Kuwait 117 Heavy, you need to say your callsign with the readback.
KU117: We do have visual contact with the traffic touching down now.
Tower: Kuwait 117 Heavy, go-around, you do not comply with my instructions, turn right heading 100 maintain 2000
KU117: Okay, go-around, turn right heading... confirm the heading
Tower: 100
KU117: 100