It is to do with consumer law in NZ - I transferred to another phone /internet provider on a 24 month contract based upon the fact that the deal I was signing up for was going to save me money for the same services provided by my current provider. The sales person outlined the cost for each service I already had and then concluded that for the entire package, it would only cost me a specific amount. I was going to save money by going across to this provider. That was the drawcard!
In the next 2 - 3 months accounts, I didn't see the deal that I had signed up for so I called and spoke to someone who was based overseas (India I think!). I faxed a letter with a copy of the page of the agreement that showed what I had signed up for, as instructed. Response - nothing! So I phoned on two separate occasions to see where my letter was at. The first response - it is being looked and someone will be in contact with you. Waited - nothing!
Phoned again - there is no record of a letter bewithouting received was the response. I was then tsferred to someone in NZ and was asked to send another letter with a copy of the page of the agreement that showed what I had signed up for. I did. Waited - again nothing! It has been 3 months since my last letter in which I asked that their services be discontinued without the imposition of me paying out the remainder of the contract term of 15 months. I have since changed to another provider and asked them to contact my current provider as they will probably get results.
Can they demand I pay out the 15 months when I believe I upheld my side and stayed with them even when they did not uphold their side, and I contacted them to see how this could be resolved? What is my legal standing please?

Already Tried:
1. Contacted the Call Centre and explained my account did not reflect what I had signed up for; 2. Faxed a letter and a copy of the page in the agreement; 3. Phoned the Call Centre to follow up my letter; 3. Phoned again as I hadn't heard from them; 4. Sent another letter and copy of the page in the agreement; 5. Transferred to another provider.