"which takes us back to the whole question of the package being mis-sold"
Yes it does, and I wasn't for a moment arguing that it wasn't mis-sold. I was simply pointing out the problem described in the article doesn't make sense.
As for how it happened, it's more than likely the records for which cabinet that particular phone line go to were wrong and some other cabinet nearby is FTTC enabled. Not an excuse of course, but bearing in mind some of the phone lines out there have been in place since they were put in by GPO before BT ever existed it's at least a little understandable if the occasional record is inaccurate.