HDFC Bank — Amount charged as loan (Aggregator EMI - OFFUS) in credit card without customer knowledge

I made a transaction at IXIGO against flight booking on 13th April 2024 of Rs 20, 426/- (paid at once with no EMI option availed). Even IXIGO customer care confirmed this over email.

But this amount is again credited to me and converted into EMI on 16th April 2024 with processing charges and interests from April onwards. In addition, unauthorized pre-closure request is raised on this EMI without my knowledge and the EMI was closed on 4th July 2024.

I have chased HDFC customer care over calls and emails (query reference number[protected] for this issue many times (even with email statement proof from IXIGO customer care stating no EMI was availed for the booking amount), with no proper support or resolution from them.

I have even raised escalations to higher authority, with no further communication from them.

I would like this to be solved asap and would appreciate this loan to stand cancelled with full refund of any additional (processing fees + interest) charges incurred as a result of this unauthorized EMI.