Very Bad Service from Vodacom

I have a CellPhone contract with Vodacom on this no.*** which was due for Upgrade since May 2014. I did not upgrade the contract until the 20/03/2015 but I was paying the monthly fees even thou I was not using the phone because I have blocked the sim sometimes last year after the phone was ******. I started using the number on the 22/03/2015 but I was surprised to receive a call from Vodacom informing me that there is abnormal usage of data since the 03/03/2014 but I only started using the Phone on the 22/03/2015.<br> I requested Vodacom to sent me the itemised billing on the 30/03/2015 but untlil to day I have not received the feedback and every time I I call to find out the status they inform me that they have closed my request and they Open a new request. NB Have sent them a copy of my ID and signed letter on the 30/03/2015.<br> The reference number which they gave me are as follows: [S3-80UA1-1879. : 00XT~T709 , 00XW~WM1C , 00XW~WP75] . Every time I pleaded for assistance they just tell me that they will assist me with 24hrs but they never did, they just closed the request. I frustrated ..Whats my options?