Bank Of Baroda — debited amount through paytm app unknowingly and without login to paytm

I was paying rs.1500 to the institute of chartered accountants of india, 1st otp sent by bank. I entered the otp but site said unauthorized access. So, i again sent otp for payment it was successful on 09/02/2018 20:56:14.
However, i have not done any transaction with paytm app till date but it deducted the same amount of rs 1500 on 09/02/2018 20:58:56.