Thank you for the fast and responsive support, I will use a new wallet now and happily continue to use secondstrade.

Also, since you have posted I have read about how people double spend to cheat websites to see if I accidentally did somehow (https://bitcointalk.org/index.php?topic=1434187.0). It says that they do it by sending a transaction where they want to gamble with too low of a fee so then they can double spend it if they lose with a higher fee, but if you look at my transaction I used a fee that should confirm it in one transaction (fee was 0.00013341 BTC). And that transaction was my whole wallet balance so I don't know how I could send again. So I am also confused about how double spending even works, please help me understand or pay me if it was a misunderstanding.

I don't know how that double spend originated, but it was from October 2015, it has over 67,000 confirmations(which means that the transaction went through I believe), and I don't see my transaction id on the link you provided anywhere so I am confused on how I double spent. I have also used that address to play on seconds trade for over a year and have played countless times since October 2015(including the day before the tx I originally posted) and have never had any problems with double spending. Please explain more how it was double spent because I don't understand.

Hi secondstrade, I have won on a bet but haven't been paid and it has more than 250 confirmations, please fix and thank you.

TX: 3ed953e97c191043126b76274801165a136a2871eb6b5301684c28b0acf150b6