For those who cares about, I got my ponies today!!
Even if we contacted ebay with the vendor to fix it, they are still considered unpaid as I never paid the abusives fees then
So there's one thing I'm sure about this whole story: if you get into the GSP it's NOT easy to get out, as ebay does not offers the usual "vendor tools". And even when you contact them to cancel it AND they explain you how do, it doesn't work.
So be carefull as vendor (and as seller as well).