Vodacom charges R10 for a bill they post anyway

Went to Vodacom website to understand why my son's airtime was vanishing. Requested a detailed 30-day report on all his transactions. Accepted the cost of R10. Instead of what they promised, they emailed my monthly statement that i already have. They then claim that you can reverse this if you don't receive your report by phoning helpdesk on 111. Helpdesk didn't have a clue what I was talking about, and insisted i phoned accounts to reverse the R10. So I'm R10 poorer, my blood pressure has escalated, and I still have no idea where his airtime is vanishing to.