I'm very sorry to hear that you ran into such issues, unfortunately those kind of things happen, I can understand the frustration very well but the max deadline was today until 07:00 AM for BST time.
It's always good to take the upload process into account & to keep a time margin as a safety net, that's why we send reminders here or via email.
There will be much more remix competitions to come & I'm sure you'll find other great tracks to remix & the opportunity to challenge yourself again, which you already did, because even if it's sad that you couldn't submit your mix on time, you worked out your best shot and achieve to remix the track : it's already a challenge !
Behind your understandable frustration, appreciated your words, that's a very nice spirit
Oh well... good to luck to everyone who have submitted, some very great tracks here."