Upgrading my account without my consent.

I've got two different active dstv compact packages with multichoice. On 22 Nov 2015 I went online and tried to upgrade one of them to Premium package through their self service option in their website. I failed do this because I had no enough money in my account according to the message that I got and I gave up. My package was therefore not upgraded. Now in Dec I noticed that I had Premium package channels and I went into their website to check what was going on and only to find out that my package was upgraded. I then called dstv to find out why it was upgraded and Mongezi told me that it was upgraded in December 2015 because of the failed attempt that I did on the 22 Dec 2015. He also told me that even the second other account that I did not even try to upgrade was also upgraded. He agreed to change back one account but refused to do the other one. He's told me I should have called them when I got the error message so they'll hold me liable. I don't think that your system is lawful so I am taking this matter to the consumer bodies for further help.