Yeah, only thing saying VSD3S is a sticker on the front of the package.
I never understood the general praise of the se215. The sound is sub-pair IMO but I'm happy to see other models with the same design coming out with attractive price-points. IF the vsd3s deliver half of what they offer, it will be worth it (je pense aussi que ça vaudra le coup)
Try separating the cable from the unit first of all, then try cleaning the internal part of both connectors with alcohol, sometimes plastic residues stay during the manufacturing process inside. Let it dry
BTW: Too bad it was you, there are always a few defective units...
Me neither. I got them due to the form factor at the time. I also only paid $50 for them IIRC.