Itunes — fraudulent transactions done from my bank account to itunes

There have been 8 transactions from my bank account to itunes on march 2, 2019. I have not authorized these transactions by any means. I also did not receive any message or mail before these transactions could be done.
Kindly look into this and i would like my refund.
The amount debited was around rs.6900 approx.

If any issues i am willing to co-operate for the same.