Contract Renuwed without my approval

On 9 December 2014 I received a call from Vodacom to inform me that my subscription for my 1 GB data contract will reduce from R99 p/m to R69 p/m. I March 2015 I decided to cancel my subscription as I was not using the 3G Data card anymore. I went to the Vodacom shop in Tygervalley, and was informed that the contract only expire in Dec 2016. I informed them that I never renewed the contract and was informed that I need to phone the Vodacom Call Centre as they cannot assist me, I phoned *** and *** without any success and decided to go to the Vodacom Client Services Centre on 16 April 2014. I was assisted by Thembisa who informed me that the contract was renewed on the day that I was phoned to inform me that the price is reducing. I informed her that I never renewed the contract, and she logged a query with reference number S3-8282P-PB0Y3 in order for someone to listen to the call of 9 Dec 2014. On 21,24 & 30 April I phoned *** and was told each time that the query has not yet been allocated even though the turnaround time on these queries is 48 hours. PLEASE RESOLVE THIS TO ME, I HAVE ALREADY CONTACTED THE CONSUMER PROTECTOR TO ASSIST ME TO RESOLVE THIS!!!