MY CONTRACT WAS UPGRATED **********

On the 02 December 2015 I received a sms which says my contract was upgraded and I never upgrade my contract with Vodacom , I called Vodacom to log a complaint on Saturday the 05 December where I receive a reference no: S3-9052P-P0X71 and I was requested to send document to email: [Email Removed] which I emailed same day, today on the 07/12/2015 I called Vodacom to find out how far is my query and Palesa and Patrick told me that my query was closed and I called again and spoke to Zinzile and she told me that my complaints is still open and document was received , my problem is I don't know who to believe as they talk different stories and my worries is if Vodacom can allow someone to get to my account and upgrade without my concern how can we trust them with doing business with them, I asked Zinzile where this upgrade was done she told me in Polokwane Schoeman street and I asked the number of the branch and she gave it to me, I want to know who did that as I feel that is from inside. I want Vodacom to investigate and reverse the upgrade because I didn't do the upgrade.