Online Sales to Correct Their Error

In January I received a call from Vodacom as I was due for an upgrade on one of my lines. It was a data contract of 5GB for R129. In February another sales person from Vodacom phoned to say I am due for an upgrade on the same number. He confirmed there was no upgrade done the previous month and proceeded to do the upgrade. He loaded a 5GB for R129. When I received my billing this month however I discovered Vodacom activated a brand new number instead of just doing an upgrade on the existing line. One of the salespersons loaded a new contract instead of just upgrading the existing line. I need the new contract cancelled as I only upgraded my existing line (the 062 number) The 082 number was added without my consent. I logged a complaint with Vodacom last week Thursday and they escalated it to the relevant dept but to date I have not received any feedback.