Breach of Contract

During the transition period between Nashua and Vodacom I received a call from a call centre agent who explained the transition and at the same time offered to upgrade my contract to a RED package which will include a new phone. The phone was never delivered, however I am paying for the new contract! I have tried on numerous occasions to discuss the matter with Vodacom (as Nashua closed down) but Vodacom is referring me to Nashua as they are saying the upgrade was done during the time when I was still a client with Nashua.<br> I signed nothing, received nothing, yet paying for a new contract!! Please advise where I can collect my phone from.