Cannot get my query resolved for 3 Months!!!

I did an upgrade online on Vodacom's online store. I received the phone. The phone is not a South African phone and thus cannot be used on the South African Networks. I have gone to the Vodacom Repair Centres where they send me away. Stating that this is an online order and that the query gets dealt with differently. After a week of Vodacom's systems being off, being sent from pillar to post. I finally get to a Call Centre Person that seemed like she knew what she was doing. She arranged that they collect my phone and that the contract will be reversed and I can apply for a new contract. Its been 2 Months and I have not heard anything. No one has come to pick up my phone. I am on a entry level phone, struggling whilst paying for a very expensive contract of a phone I do not have. I tried to call in again to find out where my query is. AGAIN being sent from pillar to post with no light of ever being able to resolve this query. I will now stop my payment to Vodacom. I will not pay my account until this query has been resolved. And I will take legal action for breach of contract. As this is not what I signed up for. Vodacom has made an enemy from a very loyal customer.