They were Telstra linesmen for almost all of the visits. The contractors actually bothered to contact me when they were coming - the Telstra tech's just turned up, did the work incorrectly, and then left. The last one who came was a contractor, and he fixed up the patching to the MDF from the building sub-exchange on all six lines. Even he couldn't believe how badly it had been botched. Crossed pairs, pairs tagged incorrectly, and since Telstra only issued one job for one line at a time, this had meant so many different visits.
To be fair the building sub-exchange was a confusing point for them all. After the 8th visit turned out to not have any tags at the MDF, I put up
a sign on the sub-exchange door. As to the following 5 visits, well, who knows what those morons were smoking.