A bit of a question for those in the know - where do I stand legally with my account with Orcon?

Here's the scenario:

I signed up with Orcon's UFB 99 dollar unlimited plan three months ago and they said they would sort the transfer of my account from Vodafone including our old number etc. So Vodafone keeps billing me, Orcon start billing me and the problems begin. Orcon says that they can't get Vodafone to cancel my account because they aren't authorised (Fair enough but why did they say they could transfer the account in the first place?). The customer service from Orcon is marginal at best - I speak to 5 or 6 different people over the course of three months. None of them seem to know what has gone on previously. They also all sound like they're based somewhere in the Phillipines and english is their second language. Now Orcon are going to disconnect my account. So I've been billed by Vodafone (who I ended up having to contact to sort out Orcon's mess) as well as Orcon for three months and Orcon don't want to hear about it  - it's my problem. Vodafone say that they never heard from Orcon and that the account was still open. Orcon say they can't give me my old number because the account is closed. I get stuck in the middle with a major headache and Orcon telling me they're going to send my account to the debt collectors. 

As far as I'm concerned Orcon never completed what they said they would do, and therefore haven't fulfilled our otiginal agreement. They haven't provided the services we agreed to (in that they failed to transfer my account). I'm pretty keen to transfer to Snap as it sounds like their customer service is good, but I'm not sure where I stand legally and all I want is for Orcon to sort out their mess and not bill me for the previous three months. 

Any advice greatly appreciated...