Dishonest Billing of Data

For the past 9 months Vodacom has been grossly overcharging me on my once-off data purchases. I raised a billing dispute on the 31st of August 2019, which to date has not been resolved. Vodacom keeps promising to call me, but they never do. Last month's invoice AGAIN had an overcharge on once off data purchases. I would advise all Vodacom customers to review their invoices to ensure that the correct amount is being charged.