I can understand that there was a technician scheduled, but it doesn't make sense for Snap to schedule a technician while tests were being completed, which essentially puts you at a higher risk of the internal wiring fee freitasm mentioned - Surely it'd make more sense to await the results of a test prior to offically reporting a fault to Chorus.
Surely testing a second modem during the wet/cold day (during the period where the modem wouldn't get sync) would've proved the modem to be not the issue, which eliminates the requirement for the second line test?

I don't mean to be disrespectful, but I am certain now there is something here that you haven't told us - Were you reluctant to get a technician out due to the fees? Were there any calls that could've even been considered argumentative on your behalf?