Welp, the screenshot you shared clearly states that you are in the top 4, said that they'll send you the code with the prize and some extra for the inconvenience and then said that the winnings were distributed 10 days ago. Looks like winna.com has some explaining to do.

I already sent them a PM, but there's no way to know when they'll go online in the forum or see my PM.

Also, the possibility that your disagreement with them could have been the reason for the delay is very unprofessional.