No, they made an order of magnitude mistake. Fairly common, it happens.
However, in this case it has taken it from “ordering bacon and avocado on my burger” to “two tickets to my local sports team including beers and chili cheese fries”. So not enough to be exactly punitive, more like a mild inconvenience. The point still stands.
0.3% of 100k is 300.
Unless you meant "an income of 100k cents" but that would be quite unusual.