Pending payment

I made a payment to takealot on the 19 July for an iPad only to have my transaction on pending. Because of the pending takealot had to cancel my order because it still said awaiting payment, it has since then still been on pending and I kept reaching out to Capitec and Takealot and I go no where, Capitec wants a authorisation letter from takealot to refund me but takealot can’t provide met with a authorisation letter because on their records it shows that they did not receive any payment. It was a lot of money and now it’s just sitting in the air and no one has it. I don’t know what to do anymore. I also can’t show proof of payment because the transaction is still pending. This is so inconvenient and I am really frustrated and considering other banks.