Items under review that don't sell

So recently I’ve been trying to sell my CS:GO knife on Game-flip, however every transactions in under review and even after this review is finished i still have the item and the buyer has left a poor review, another problem is not being able to see the message between the buyer and selling during the transaction after it has failed.

Any idea on how to fix this issue so that I can sell my item would be great

We apologize for the inconvenience that this has caused. When this happens, this is to verify the payment method of the Buyer for you item. If the Buyer cannot validate and verify their payment we will cancel the listing and it’ll go back onto the marketplace. Unfortunately there’s nothing on your end that you can do in order to assist with this, and the communication will not become available until the actual listing has been sold in which we verify that the payment is safe to proceed.