Sounds like a large German prefabricated house company. It was the same with us, the right of withdrawal sounded great, but when we actually inquired about a specific plot of land in an advertisement: No, sorry, the ad was incorrect. We then researched the company and stayed very far away... they advertise plots of land that do not even exist, just to bind the buyer to a contract for work, which is then not so easy to cancel afterwards.
