Whale I don’t know what the problem is but some of the entries don’t show up in the list down the left hand side and this is one of those initially as this is the first time I’ve seen it and I log on most days.
As to OP problem if you have the default bylaws their is this
19. Notice of a change of lot usage
An occupier must give the owners corporation notice if the use of the lot changes and the insurance premium for the scheme changes, for example change to a hazardous activity using chemicals or change from residential use to commercial or industrial use.
So check your bylaws.
If you have this sort of bylaw inform the owner (not the tenant) that you have informed the insurance company and they want to know what sort of business is being run from the lot and they estimate that the lot owner will be liable for an extra premium of approx $X,XXX due to the change of use. Don’t inform the insurance co just tell the owner you have to put the wind up him.
If that doesn’t discourage him ask him for a previous phone bill showing multiple lines being paid for and until you have this nothing will be done.