(4) Where, by virtue of an enforcement notice, any use of land is to be discontinued, or any conditions are required to be complied with in respect of the use of land, any person who, after that notice takes effect, uses the land or causes or permits the land to be used in contravention of the enforcement notice, is liable on summary conviction to a fine of $10,000 and, in a case of a continuing offence, to a further fine of $250 for every day after the first day when the use is so continued.