He didn't even pick up the phone, he admitted he never communicated with IK during the incident.
He's lying, because he wants to win votes.
If he was willing to escalate, he would have done so.
This entire incident put Pakistan in a far better position than it has been in literally well over a decade. IK's actions won a lot of international respect for Pakistan, and the Pakistan air force's reaction brought a lot of sanity back to the world. The world now knows that Pakistan wants peace, but it won't be pushed around; it also now knows that India's words should from now on be taken with a grain of salt.
All in all, Modi is lying, because election season.