This passiveRef href identifies the by-law that amended this by-law. So the href should be the 'short name' of the by-law as if you'd parsed it via steno (ie. you have to make one up):

`/za/by-law/cape-town/2012/credit-control-debt-collection-first-amendment`

You're also missing a space between By-law and 2012, right at the end.