I would say the same thing. Know your market. Know its rules. Read what the screen tells you. Never order until you fully understand how it works. Have your currency in the correct format and place before you order. If you have a 30min window, and you ordered but it took you 20 mins to get your coin ready to deposit, you should wait for it to cancel and order again when ready. I dont use t2d, and looking at their website, XMR deposits are considered registered after 1 confirmation, which should take no more than 10 mins in most cases. If you failed to read the things on the screen, and send funds after the 30 mins, there is nothing support can do, which is likely why they havent gotten back to you, and no mod on dread can do anything at all for you, except say "so sorry, read and know what you are doing before buying drugs on the internet." Always assume your coins is 100% lost after ever time you send it, never spend coin you cant afford to throw in the trash.

If you are full of "what if's" as to why you couldnt make the 30mins, you can always deposit to the wallet on the market first, once thats clear, then order. done. problem solved :P Also, if you think a direct pay is helping the vendor avoid an exit scam or something, it doesnt, market wallet to vendor wallet or direct to vendor wallet still goes to the same place, the vendors market wallet which doesnt clear until escrow does.

yeah, thats just how btc works, once its sent, you cant cancel it and it never 'bounces back' as returned or anything. If it works how i think it does, the key that signed the wallet was only valid for 6 hours, and then expired, so it went to that wallet, but after 6 hours noone can access it, and it just sits there forever now. I could be wrong, but thats my best educated guess.