I didn't know there was a support path that could handle this situation but your comment prompted me to search harder and I managed to talk to a call center in India? that purports to have solved the problem. We'll see over the next week.
Bezos boasts about Amazon customer support (call center), they will surely sort out this mess.
Later on after the timeline
if they collect the penalty, then you can take Amazon and Supplier to Consumer Courts of EU/Spain and might be able to get compensation and apology.
Antagonizing Amazon doesn't seem like a good idea since I rely on them for certain types of products that can't be obtained elsewhere around here.
Also, I don't live in Spain or speak spanish, so that might be a little complicated.
But let's hope this gets solved. Amazon started a new collection for the UPS, but it's the same logistics company and I have yet to hear from them regarding it.