So frustrated!!!

Last week I tried to make a purchase on a sports website. I was redirected to Payflex's site, input all my details, was directed to my banking app to confirm the payment and paid! Payflex received the payment as per my bank, but the merchant did not receive it on their side and I also was not redirected to the merchant's website to finish placing the order. I did not received an order number or reference. I emailed Payflex numerous times with proof that the transaction went off my account but I have stopped getting responses from them. It's been over a week now and I am frustrated as I do not have the money to place another order while I wait for this issue to be resolved. I just want my money back and don't see why I have to beg.