I received my voucher, and have already made my pre-order for a complete device. All went fine and smooth. Now, my voucher was bigger than the pre-order amount, so I receive a new voucher automatically with the remaining amount. I then went put 120x "Down payment top up" and put my voucher code (which is for EUR 20). When I hit "OK" I get "There is 1 error. You have not reached the minimum amount required to use this voucher".