********** data bundle added to my Telkom account

I have a Telkom Mobile Data account. On a recent invoice that I received, I noticed a R29 additional data bundle being charged to my account. I called Telkom up and they told me that I had a 100MB additional recurring data bundle added. I know I did not add any data bundle. The bundle was removed. However, Telkom was unable to tell me how this bundle was added and who approved it.

A ********** activity occurred on my account but they cannot assist me on how or why it happened.