Order online, pick home delivery and pay online or...

Order online, pick home delivery and pay online or at delivery. This way they probably won't be able to use loopholes in the law to deny refund to online orders because you decided to pick up the order from their showroom.
Update: After being contacted and having a chat with the CEO, I understood their point of view - there are many customers that abuse the law by returning products that they took only to test and with the original package opened, the company cannot resale the product as new.
Still, there are solutions to this issue, solution that one of the competitors already implemented successfully.