That's your own fault for growing autos. Some stay very small. If you want real plants, grow real seeds.
Btw, you were even lucky to get a reply from them since they are sold as souvenirs.
"Seeds Germination. Our cannabis seeds are sold as souvenirs. Any information about germinating, growing, smoking or doing anything with seeds other than keeping them as souvenirs is intended only for people who reside in countries where growing Cannabis is permitted. In the Netherlands it is illegal to germinate cannabis seeds without a license from the Home Office. If we suspect that you intend to germinate or have germinated our cannabis seeds we will refuse sale."