Vi — Transaction Failed. Amount deducted twice

I have recharged with Rs.449 through Vi mobile app using a debit Card. At first it showed up transaction failed, and I went back to app home page and made fresh attempt then got recharged done successfully this time. After 8hrs again the same amount (Rs 449) gets deducted for no reason and that's twice. Am I a victim of mobile operator scam too? Because it's becoming an un-registered and popular act of scam now-a-days with many. Most of the cases I asked and checked, the amount does not get refunded neither the validity gets extended or reflected any where in app.