[Karunamon]

>This was an intentional attempt to cheat the system

You don't know that. Say the seller has a faulty scale and does large numbers of transactions at once. 100 packages go out, and 100 postage due complaints come in.

Oops. Clearly the seller is a scumbag. </s>

[illuminate]

A non-scumbag would resolve the issue for the customers and fix the systemic issue. That this continues to be a problem is a sign of a bad seller. The first time this happens, you need to re-calibrate your scale.

In their defense, at least they offered to refund the extra shipping cost, but relying on not being caught to save a small amount of money is not worth it in the long run.