Myntra.com — money deducted from my account directly that too around 15000

Address: 411057

I last stopped on 8 sep 19 and all process return refund was all done. Yesterday 23 sep total 5 transaction were made by myntra of around total 15466 with my otp or my concern.
I don’t know how they made this transaction but this is frustration for such huge amount. I have bank statements and also there is no purchase made on myntra after 8 sep. I want my money back. It’s hard to believe myntra company is not safe. I have been the customer for around 4-5years now. I am filing an fir. How can money transaction be made without any otp or any password directly from bank account. Myntra not happy.