If they are completely straightforward, it would have saved someone a trip to the post office.
companies cause stress when you can't trust them. You don't have 100% confidence that you'll even get a refund. You don't know what they're capable of if they are even misleading you by accident.
When the company gets annoyed or mad, then how do you trust them when you send back your data? You can't.
the worst feeling is that you feel that you are taken advantage of, even subtly.