Wrongful billing and deductions

I am loyal customer of Vodacom however lately i have been disappointed by Vodacom not responding wrt my complaint regarding the wrongful billing and deductions effected on me wrt this number ***. The deductions started around April 2014 when I was away in the Northern Cape and upon my return in November 2014 I went to the vodacom shop at Heidelberg mall to report the matter and after they checked on the system they informed me that the phone (so called i-phone 5) I am billed for was dispatched from the Vodacom Call Center. I was told that they will log a call but I need to get a bank statement and write an affidavit and then fax them to the manager at fax number ***. I did that and faxed the documents on the 9th of December 2014 and since then I have not even received a confirmation of receipt of my documents. I have not received the said phone nor have I agreed with anyone on that matter. I am billed for R599.00 and I need for my money to be refunded and that contract terminated. I resent the same documents today the 24th of March 2015.