It probably puts it in the internal wiring of the building, rats chewed distribution cable in the roof, or something similar. The Telstra fella is only obliged to test to the network termination point, in your case it will be the building MDF, in a house its the first socket. Get the internal cabling checked before you go running off to the ombudsman or you could end up looking silly. If it is the internal cabling the Telstra fella could actually have charged you for the callout.