It seems there is a bug with the PSN, at least in France...
When you purchase DLC, the PSN charge you more than one time!
It just happend to me. The Sony support say by phone that's a big problem since the release this morning. Many users are calling for being charged up to five or more times! Some got five time the same DLC, other got nothing... I've got two DLC on the same account!!!
It's unclear if it's a random bug, perhaps linked with the mutiple accounts on the same PS3, but there's big trouble and they may suspend the DLC release untill they find where the problem is...
Nothing official for now, it's from the customer support.