Ms Ewing said the company's unwillingness to discuss the matter spurred them to take the matter to the Pukekohe disputes tribunal - which ruled in their favour a week ago.
She has spoken out to let people know their rights in such a situation.
"I think the pivotal thing here, which the disputes tribunal pointed out, was that the onus was on Metropolitan Rentals to prove that we had caused the damage.
"It's important that people are aware that the responsibility is actually on the company to prove that you caused the damage, rather than trying to prove your innocence."
Metropolitan Rentals general manager Andrew Langridge refused to comment yesterday, other than to say the matter had been resolved through the tribunal.
According to the judgment of referee Jack Tam, Mr Langridge conceded at the hearing that no pre-hire inspection was done on the truck.
No photograph of the damage was provided nor was an invoice or documentation to show how the charge of $280 was arrived at.
"Having regard to the lack of evidence in this claim and that the respondent carries that burden of proving the reasonableness of their charge, it is my finding that the applicant is not liable for the repair costs," Mr Tam wrote.
Ms Ewing said she was amazed an established company such as Metropolitan Rentals would not carry out joint pre-inspections on vehicles.
She said Metropolitan Rentals had provided a damage report for the truck, but it was undated and made no mention of damage to the truck's door.
Consumer NZ chief executive Sue Chetwin said the disputes tribunal decision was important for other people who may find themselves in a similar dispute.
"Even though [tribunal decisions] don't set precedent, they are a mark in the sand for people to know what side their rights are going to fall on."
Ms Chetwin was surprised Metropolitan Rentals had not carried out a joint pre-inspection of the truck.
"I would have thought for their own benefit ... because as it's turned out ... [Metropolitan Rentals] don't have a leg to stand on because it has not got any evidence to show when dents occurred."
DENT DISPUTE
* Couple accused of denting rental vehicle.
* Rental company takes $280 from bond.
* Disputes tribunal rules company must prove dent not pre-existing.
* Money refunded after no pre-hire inspection completed.
* Case a "mark in the sand" for other renters.