They have said that they are looking into it. But from what they said to me, they are looking at something else which is not the actual problem. When I try to give more details to clarify the problem they try to end the discussion and inform me I simply need to refresh the page more. 

Left side shows all I saw after many refreshes during and after the auction ended. Right side is what showed an hour or so later on.  

This still happens now. The auction ended with the timer reaching zero seconds with me leading the bidding and the timer changed to say "Closing". I had refreshed the page constantly to ensure I led the auction and wasn't outbid. When I went to pay, I found it showing up in the Lost folder instead of the Won folder, where it showed another bid of $5 had been placed. I have a screenshot of the finished auction with my leading bid. Trademe support are blaming me for not refreshing the page and have told me many times that I should frequently refresh the page in the final moments of an auction...