Itemized bill from Vodacom will not send despite contractual obligation

I upgraded by cell phone contract so I could obtain itemized billing e-mailed to me on the first of every month. This is necessary so I can claim for the call I made in connection with the business. I have tried every thing firstly via the dealer then through the Vodacom Customer Care Center for the last 3-4 weeks but simply cannot get an itemized bill despite agreeing to pay for this from the beginning. I eventually got through to a consultant at the customer Care Center and sent off a copy of my Id and the reference number given in the subject line via email. The only response is a request for the reference number which I have already furnished. From then on the call center 082 135 when you select 0 to 'chat' just cuts you dead every time. I have signed a 24 month contract but if they will not provide an itemized bill how can I have this contract declared null and void?