Multiple errors and lack of delivery on promises to correct

I have 5 contracts with vodacom, however this is not the first time that I am really unhappy with vodacom. Normally, due to lack of trust, I usually prefer to do upgrades instore, however there were errors and issues with even my last in-person upgrade (which took 6 months to sort out), so I therefore opted to try online upgrade for my main number / current upgrade. Throughout the process I checked that I was logged in on the right number on the screen. An added note, which I found out at a later point when I went back to check all confirmations received, that nowhere in any of the sms's or email confirmations that you receive during the process, does vodacom ever confirm the number that you are busy upgrading. And so it happened that the incorrect number was upgraded. When Vodacom phoned me the next day to ''confirm'' the upgrade, and ''confirm'' the number, I immediately informed them that the number is incorrect, and that the issue needs to be corrected. The ''request'' was submitted to a team leader and I was assured that I would get confirmation that the upgrade has been cancelled so that I can restart the upgrade process from the beginning again with my main number. Its been 2 weeks since, multiple telephone calls later, and I still have not received confirmation that the upgrade has been cancelled! I am so worried, and I suspect this is exactly vodacom's plan, that they will charge me for the incorrect upgrade! I am so fed-up that I feel like cancelling all my contracts and moving to a different service provider! I will NOT upgrade my main number until I receive confirmation that the incorrect upgrade has been cancelled, and if the issue is not resolved soon, I will be moving all my contracts to another service provider!