This is why so many factories wont deal directly with consumers. Combination of not being equipped to deal with the transaction costs and not quite being ready to respond to issues like these. Service costs money. At the prices being offered, there has to be a limit to what Leon can do. Having built wheels, brass vs. alloy nipples is like 40g. Difference in finish? Sure that's believable. Variation in the rims themselves + spoke and hub weights vary too.
We all understood the disagreement. Leon quoted either the wrong or too optimistic of a weight. I personally feel like posting his email to you is unnecessary. If you want to air all the dirty laundry, let us all weigh in on your proposed refund amount as well.
1530g is still really light. Granted some of these wheels are wider, but the Nextie 60 65 set needs Extralite hubs to go sub 1500g and while wider, Light Bicycle cant get there either with their 65mm wheels.