The simple answer is they are ill informed on how to assign values for duties and customs clearance.
They should have used the cost paid for the helmet especially due to the fact it is on clearance and not just a sale.
I would contact them and advise them of the error and see what they will do for you if anything.
The short version is if they don't reimburse you, it is not worth the effort to go to Rev Can for difference as you will need all the doc's to substantiate it was an error and amend it.
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