I'm on the 25gb adsl plan and all of my traffic was used up in 2 days and I wasn't downloading (to my knowledge) at all during peak hours. I checked my wireless router to ensure no unknown mac addresses were connected and found nothing. I also checked the bandwidth usage on all of my PCs and there didn't appear to be anything untoward happening.
I ended up raising a ticket with Slingshot via email and received the following response:
Thank you for using Slingshot's Online Help.
There is a known issue with broadband data that we are working on fixing at the moment. We appreciate your patience.
I hope this helps to resolve your query. If it does not, please do not hesitate to reply to this email or to contact us on 0800 89 2000.
Slingshot Support Team
So I am now unsure what to do. Do I need to ring them to get my usage fixed or just wait to see what happens? I am unsure if I am capped as some sites were not loading and the speed appears to vary; speedtest was showing 3mbps to an NZ server after the cap had reached 100%.