A couple of months ago we received a letter from the town. A neighbour from the apartment building across the street had complained that our grass was too long.
Actually, it was our tenant's grass that was too long.
They even had pictures of the lawn. Bylaw stated that grass couldn't be more than 3 inches.
Anyways, if we didn't (in this case, the tenants) mow the lawn, they would hire someone and send us (tenants) a bill.
Maybe, your bylaws work the same way?