Vodacom unauthorized depletion of airtime

Over the past 6 weeks we've spent R1100 on 9 transactions of airtime varying between R110- R120 per purchase, only to end up with no airtime to make any calls. We've tracked our actual calls which amounts to a total of just of 17minutes for the period 19 April to 13 May 2024. Contacting Vodacom on 082135 is of absolute no use as it is a system driven service with no real person on the other end to engage with and resolve the issue. We have not clicked on any banners or selected any other service that could explain the airtime usage. This sounds like just one of the many incidents that have been reported on where Vodacom has been accused of and proven to ***** the airtime. I am beyond annoyed and can't find anyone to talk to over the phone to demand an explanation and a refund.How does one stop this *****alent behavior!!