network blocked

I have called the call centre 4 times concerning my iPhone 4 which is blocked on the network. The first agents claimed I'm using damaged sim cards, the second said I should call iStore which I did and was told to call the Network Provider that restricted my network usage, the 3rd said I should go to my nearest vodacom store so I did that. I went to East Point Mall formly known as East Rand mall where I was told to go to the vodacom care centre at Lake Side mall. So to avoid driving there for nothing I called instead and I was advised that its the call centres job to remove the Network Restriction and there is nothing they can do.. I then called the customer centre again was advised to go to my nearest vodacom store to get it checked.. <br> This is exactly why I want to leave vodacom because this is poor service at its best no one knows anything.<br> I'm patient but this is too much now. I just want my phone to use the sim I want.