********** contract renewal! Not getting any help!

My contract with Vodacom was supposed to end 4 September 2015 as I signed an agreement 2yrs ago this day. Last week 28 August I went to my local Vodacom store to upgrade my contract. The consultant checked my profile on the system and informed me that I had already performed the upgrade on 30 July 2015? How was this possible? I did not receive any SMSes informing me that this was happening that day! I was infuriated. I asked the consultant for additional information concerning the upgrade, but was not given much detail. I then left the store and contacted the call centre. The operator tried to assist me further and informed me that my upgrade was performed in Bellevue by a man Teronm. Allegedly the upgrade was performed over the phone with my security answers being supp****, but my address as per the operator was different. I live in Ladysmith, KZN and do not know where Bellevue is nor have I ever heard of it before this incident. How lax is your security that you allow somebody to upgrade my contract without my knowledge and do not even notify me via sms as is your protocol when an upgrade is requested. I WISH TO TERMINATE MY CONTRACT! UNACCEPTABLE!!!! call ref: S3-8EO2U-UCVH1