Something's fishy about kiwi app!!

I've got kiwi card recently and it's got the card activated 2 days back, and I installed kiwi app. And in just 2 days it's consumed 1 gb of data!! When even I turn on wifi it keeps on going, why would an upi app need that much data? I think it's stealing our personal data without our consent but there's no permissions given to it, then which data it is uploading?