Unhappy customer

I wrote to you explaining about vodacom delivering wrong products and collecting the wrong items after saying the order was cancelled. Today i called after them AGAIN just to find out they refuses to clean up their mess and clean my name cause i urgently need a phone for work and cant get one cause they claim that i must pay the amount of R800 for products that i did not order, returned and what they led me to believe through lies and terrible client service that it was indeed cancelled. I refuse to pay something i did not ask for or using. Please help