Sneaky Cancellations department

I called in to do a Cancellation of one of my contracts in April. I specifically said all I wanted to do was CANCEL that contract. Low and behold I get this months bill and my total has increased - because some forward asshole at your cancellation department decided on his own to force an upgrade on my other line?? How dare they do that without my consent! I did not sign anything, I did NOT agree to it so why was it done? I want the upgrade REVERSED immediately and I hope for Vodacom's sake that when I get my bill next month it is back to its original charge. The ref is ***. I want the upgrade reversed for ***!