REFUND DUE

I went to the Olivedal Hospital emergency room with my son on 15.08.2023 & was assisted well. Paid cash & left. Few days later i received an email that i had a refund due to me & that i had to provide the debit/credit card details that i paid with. I told Asipha Qina that i paid incash which she denied & said on their records it shows that i paid using a card. I do have a slip that proves i paid cash. Been sending this person emails but no response or way forward whatsoever. I'm really disappointed because for such a big institution to treat clients like trash is just not on.