It's silly, but it only takes 2-3 minutes to complete the DOT complaint form. DOT requires the carrier to respond and given DOT rules, there really is only one lawful response. Thus, the refund is issued and the carrier responds that it has complied. But, it is one more reason not to delay filing these complaints and a chargeback with one's card issuer as well if the carrier has not initiated a refund within 7 days of the request.