I have been using Call zero for years as a low cost way to make international calls via a normal landline, but it also allows you to make free NZ calling. However since moving house with a new number, it doesn't work. When you enter your details on their website, it should ring the number, but it doesn't.  I have tried to contact their support, but no reply. As they are owned by 2Talk and I contacted them, and although I did get a reply initially to try something, after giving them the results, they also didn't reply. Currently I have an amount of credit with them which i can't use. Anyone know why this may not work or have similar problems. I am thinking it is something to do with having a newish landline  number.