Unauthorised contract

Some Elizabeth Haden called from *** offering me a contract upgrade. This happened after I had queried my data that was less than what I signed up for. I told this Elizabeth that I dont want an upgrade, but rather for MTN to solve my query. I told her not to change anything on my account but rather fix my problem. I ended the call by saying I dont want any upgrades. Just a few minutes after I hung up, I received a contract on email saying I have been upgraded for a 12 month's contract. I then called 135 to cancel the contract, and they kept transferring me to other departments to which I kept on getting cut. This is *******, an upgrade was processed without my authorisation. MTN need to do something about this. It cannot be that MTN staff process unauthorised contract because they need to meet their targets. How many people do they do this to? I need action taken against people like Elizabeth. I will escalate this further. WHY CAN'T MTN CALL CENTER ASSIST??? WHY DO THEY TRANSFER ME TO THIS PEOPLE I DONT EVEN KNOW? HOW DID THEY GET ACCESS TO MY CONTRACT INFORMATION. MTN IS ALSO LIABLE FOR THIS MASS AND SHOULD BE ABLE TO ASSIST ITS CUSTOMERS. THIS IS FRUSTRATING.