Utrecht does not have a street called "De oeverlaan" The postal code 1132 LP belongs to Volendam which does has a street called "Den Oeverlaan" which comes pretty close to the registered street. According to the chamber of commerce 10 companies are registered here with no company registered to a Tim Bloksdam as far as I can see. The tech phone number looks like to belong to a guy with a different name living in Apeldoorn working as freelancer and interest in blockchain. Maybe something will give you a lead but it looks like they gave up some false info so please be careful not to accuse the wrong people.

P.S. I also have a withdrawal stuck on coinhouse for about a week now.