Invalid Serial Number with Behringer UCG102

Hello there,
I've recently bought (so nothing illegal ! ) the Behringer UCG102 guitar - usb interface, that comes with demo versions of 3 guitar combos, and a serial number to activate one of them.
When I enter this serial number in the Service Center, the borders of these field turn red, and the activation button remains disabled.
I do not get any actual "invalid serial number" messages, but it surely looks like this - of course I've tried several times to make sure it's not a typing error.
After getting no response on my ticket for 8 days :angry: , I decided to give a go at this forum. Or maybe I'm just to impatient . But I get so angry with the omnipresence of every single business on the net, with flashy sites, but that are nowhere to be heard when you contact them :|
Great stuff though, those guitar combos
Regards from belgium,
Piet