Flipkart — Unauthorized transaction and money deduction

I (Komal Setiya ) have been charged for an unauthorized transaction for a flight booking which wasn't done by me. The PNR is UH2WSY from Indigo airlines. This ticket is from Pune to Guwhati and has been booked with two different accounts of flipkart.
One is from my account ([protected]@gmail.com) and other is from bishal Sinha's account ([protected]@gmail.com). We two are totally unrelated people.

Additionally, I also have been charged of 5890 rs. for this ticket and this unauthorized transaction has been made from my Flipkart account through HDFC credit card.

How is it possible that one flight ticket is with same pnr booked from two different emails and two different accounts . This is clear case of lack of cyber security in such a big ecommerce platform.

For reference: Flipkart booking id-FF[protected]
I have reported this issue to flipkart and HDFC both on 17th june. Sadly, there is no response from both the sides till this date. The innocent customers like me shouldn't be penalized due to lack of secure transaction system at Flipkart. I am requesting my money back as soon as possible.