No, that is misrepresentation. They can only take money for the purpose it was intended, so if they didnt intend on making a claim, you didnt need to pay an excess.
You may have had to pay for a repair or contribution towards it though, as the damage was not spotted when it was booked out. Or in the alternative if they dont repair, the depreciation only because of that dent.
You need to write and set out your losses and request a refund within 14 days or say you will go to Court within 14 days. You should make sure you send this signed delivery and keep a copy.
If they do not refund you then you can issue proceedings in the County Court. You can either do this online at: www.moneyclaim.gov.uk or by completing form N1 http://hmctsformfinder.justice.gov.uk/courtfinder/forms/n001-eng.pdf and take it to your local County Court.
The Court will then issue a claim which a copy will be sent to the Defendant who will have a limited time to defend it, if not you can enter Judgment and enforce.
If the claim is for £10,000 or less it will be a small claim so you will not need legal representation. Over this value you would need representation for trial.
Can I clarify anything for you about this today please?