Not a glitch.
IDFC offers welcome benefit of 2000 RP on 1st transaction, on First Tap, above 1000. See on the app itself.
Since their welcome bonus is tier based, depending on classic/select/private/wealth, getting that much point maybe a glitch.
Recieving 2k is not glitch. More than that, maybe...
T&C likha hai, lekin aise koi T&C nahi mila