I already did so many deals like this and never happen to get a a-hole like this...
I know I won't get my btc back I'm just advising people to not fall in schemes like I felt today
Don't deal through auto-buy links as those sites don't care in case of dispute and anyone can farm trust their easily. On other hand you can't verify the reference and accuracy of the feedback so it's pretty easy for someone to create a good looking account there and set a trap.
There is already a sticky in Digital Goods section with title asking to avoid such platforms.