Clearly the Comm Comm does do something, they prosecuted Noel Leeming after all. Making a CC complaint against Warehouse Stationery might not yield an immediate result, but it could contribute to a further prosecution.
The shop assistant who said "We don't sell those any more" seems to be suggesting a replacement would be out of the question on the basis of it being a discontinued model. I suspect that if you wanted a replacement they would have to give you an equivalent new version.