Assuming they didn't know they had to pay the charge and an assessment was raised on them, they would have 90 days from the date of the notice of assessment to file an objection with the minister. Subsequent to that, the minister of course will consider whether the assessment will be confirmed or not.
Evidence of meeting #33 for International Trade in the 39th Parliament, 1st session. (The original version is on Parliament’s site, as are the minutes.) The winning word was companies.
A recording is available from Parliament.