Contract upgraded **********ly and MTN cant assist

I took out a contract with MTN in 2014/04/04, My contract was supposed to come to an end on the 04/04/2016, On Saturday 05/03/2016 I received an SMS from MTN stating that I have been migrated as a contract subscriber shortly after that I received another SMS informing me that 30GB has been loaded. I called 809 this morning and I asked Eunice Tshabalala(no empathy) to check the package I am on to which she advised me that she cannot see, i then told her about the SMS's and thereby she confirmed that my contract has been upgraded, i asked her to confirm for me who authorized the upgrade and she told me that she can not view this on her side and will give me the contact details for the ***** department, She gave me *** and ***, I have been calling these numbers all morning and they ring unanswered. I cannot use that phone at the moment as I do not want to use the data that I never asked for. I intended to call MTN within this week to give them a notice to cancel my contract when the expiring date comes and to discovered that I have been upgraded without my knowledge is appalling to say the least and to have no one to talk to to resolve this is even more frustrating.