No response/clarity-calls being avoided

An amount of R758.27 was debited from my account from Vodacom, my bill is usually in the region of R180. I 've spoken to Bo to look into it but have not received a response. The R180 I pay usually covers the cost of my son's tablet and my wifi router. When I called on Saturday, the 27th February to enquire about whether my son had data left, it was confirmed that he had just over 500 megs of data left. I cannot remember the name of the person I spoke to but you can retrieve the call log as I spoke to a female employee of Vodacom before 10 o clock in the morning. Please address this as a matter of urgency, I did not budget for an over R700 bill from Vodacom.