Union Bank Of India — regarding refund of my amount

Address: Mumbai City, Maharashtra

Hi

I booked my redmi note 4 mob from my flipkart account on 7 oct at 6.35pm. After placing my order i made payment through my union bank of india debit card and entered the otp.
But my transaction get failed and shows msg that this transaction get declined by your bank and i received a msg thatbmy aacount get debited with rs 9999 even after transaction failure. I also get a msg from flipkart that we received ur order with txn id - tx[protected] and wevr trying to confirm the payment with ur bank. When i contacted them they said didn't received any amount from this transaction id and said try to get in touch with ur bank.
Now its over two day and didn't get any refund back. Please help me in getting my refund back as soon as possible.
Thank you