Refusal of proof of payment sent from my bank

I placed an order online on the Homechoice website on 17 April 2024 using my credit card. I immediately received an email confirming the order and payment. I thought everything was in order until I realised that the order was taking long to be delivered. I therefore made a follow up and was informed that they couldn't see the payment made and I had to send proof of payment. I requested proof of payment from my bank and sent it to Homechoice only to be told that they will not accept my proof of payment. This is very disappointing because the proof of payment came straight from my bank and there is no other way I can proof payment if not through the transaction reflecting on my bank statement. I feel like this entity is ****ming people as I still don't have the goods and I can't get a refund.