Useless after sales service

I recently upgraded my contract with Vodacom, I wasn't sure whether I was due for an upgrade, so I went to My Vodacom app, and clicked on upgrade. The response was Congratulations, you are able to upgrade. So I went via the call center and proceeded to upgrade mine and my 2 kids contracts. At no point in time did anyone mention to me that I was upgrading early, and would still be liable to pay of the previous handset. When I queried this with Vodacom customer care, they said the Rewards department must answer my query, as they did the upgrade. The response from the Rewards department was that they don't have this in their speech from the call center agents to advise customers that it's an early upgrade. They would only tell you if you specifically ask. I then took the query back to Customer Care, to date still no response. I've copied the CEO into an email - to date no response other than they'll get back to me. I'm STILL paying for 2 handsets, months later!!! I wish I could cancel with Vodacom and move to another service provider, but I'm tied into these contracts now!!! The most **********, disgusting service. I would rate them less than one star if I could