Just to reinforce one of JT’s points: The strata manager works for you and the committee can and should make decisions and direct the strata manager. Don’t let the tail wag the dog. If you have sent two nice informal parking notices around, it is time to get serious. Don’t ask. You direct the SM to issue notices to comply. Make it a decision of the committee taken at a properly convened meeting with minutes. Let the minutes record that the decision to issue notices to comply was made after having sent the previous circulars. Make sure the text of the notices to comply contains all that is required by the Act for a proper notice.
It is right and proper for the SM to give advice, but the committee makes the decision on behalf of the Owners Corporation and does not have to follow the manager’s advice. The SM is your employee and does have to follow directions. The only exception is if you were telling them to do something that would be illegal.