IDFC Bank — Refund of failed repayments transaction

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Idfc amazon pay later

I repayment of 59rs my amazon pay later transaction on 21 oct 2021 and it failed and again i tried the repayment on 28 oct 2021 and it again failed then i tried again on same day and it was successful. But i never get refund of previous two transactions. I tried to complained in idfc customer care but they said that there is no data linked to my phone number. how is it possible if there is no data regarding to my phone number and you approved pay later.