Grr. Their lame site checks the referer. Never heard of marketing studies, discsonline.dk?
Check for a code starting with ZD in the hub area. For my MII by MBI Verbatim 16x DVD+R, it's ZD3121-DVR-T47D.
Also, by looking at the inner hub, you can tell whether it was manufactured by CMC, Prodisc or MBI.
(The Prodisc codes have a dash in the code, the CMC codes start with three letters like PAP, PAH, MOP, and the MBI ones have a code like 5250 529 +R E F 06202.)
I guess you either bought factory rejects or fakes. If the discs do not feature the ZD code and/or the manufacturers codes, then it's most likely fake. Fakes are made by the usual suspects which also make TY code fakes, such as Infosmart of Hong Kong. Gee, I guess it's time to start a "The MCC/Verbatim FAQ" thread