Airtel — wrongly deduction of main account balance

Address:

560015

I installed my airtel app on 15 jan 19 at about 2100 hrs and i got 1 gb complementary data with 7 days validity.
I used the data and data is still remaining.
But about 30 rs wrongly deducted from my main account balance. Kindly do the needful to refund my account balance as soon as possible. Earlier 23 rs was deducted from my main balance for 28 days validity on 7jan 19. And didn't make calls or use any service.