Vodacom cancellation

I'm now living in New Zealand and been trying to cancel my vodacom accounts since January 2015. I phoned them every night this week (time zone) and was put on-hold for 30-45min.<br> <br> My accounts still not not canceled and received another account for R 2500 on data usage even though my sim is locked and not in use.<br> <br> Can anyone help me? Costing me a fortune to hold-on for someone to answer and then just to put me on hold.