British Airways — Money deducted twice by bank with "MPS_MCDMDU_BRITISH" narration

I had booked a British airways flight on 14th of March and it costed about INR 1, 15, 568. Today, 21st March, another amount of INR 57, 784 was deducted under the narration MPS_MCDMDU_BRITISH_5699_3/15/2. I did not initiate this payment. I haven't saved my card details on the british airways site. I want to understand how was this payment approved and want a refund asap