Call centre MANAGER confirms that this is the correct charge and includes a "surcharge" or GST.
A surcharge or GST? They don't know which?
See that's the thing - first it was a "surcharge", then it was "GST", then when I pointed out it was zero-rated it kinda became a surcharge again.
I don't fully blame the Slingshot CSRs - I truly believe that Slingshot doesn't understand the bills that Vodafone NZ sends them and so they just plead innocence. "um, well Vodafone NZ billed us $3 so you have to pay us that (plus GST).
It was me that suggested that this was a "GST" charge. What else would make a $3 charge $3.45.