Missing part from new mad rat kit!!!

[Timee80]

Just started the build on my new mad rat kit and found that im missing the plastic "T-nut" part no. 125000406. Has anyone else had this problem? and how do i get in contact with ansmann about it?
Been really impressed with the build so far and i cant beleive they could produce something of this qaulity for so little cash. Then this goes and happens and spoils it.