Online purchase paid but never delivered

I have made an online purchase of a monitor on the Dell website. Did all you have to do including paying for it. (i have paid as a guest, so not logged in with an account). I have received on my screen the confirmation that all was correct and that i would receive a confirmation by mail soon. I have never received a confirmation nor my monitor. I have made a print of the information on my screen.

That is all the information i have.

Dell purchase-ID: <Your private information was removed from this public post. DELL-Admin>

I'm unable to contact Dell becouse every contact needs an ordernumber. And the number i have is not accepted by phone or by chat.

I even went to the Dell headquarters (Amsterdam - Holland) and talked to some people there. Finally got an e-mail address from somebody that is supposed to be able to help. I have been 4 weeks now, i have send a few reminders but still no reply at all.

I have no idea what more i can do but to go to the police.

Anybody have any suggestions? All the help is much appreciated.

Thanks.