why is vodacom robbing customers

I loaded airtime and purchased data bundles but I was still charged on my airtime. the stupid agent (Nolwazi Zaza) that assisted me **** and said the system didn't update as to why was I charged on my airtime and when the Team leader (Musa Kaiser) spoke to me said I was charged for Internet connection, my question is why was charged if my mobile data was of and why was I charged while I still had data bundles. I need answers and the team leader didn't have any. Someone needs to answer.