Outrageous Billing Error!

I cancelled my subscription due to affordability issues. Their promise: - Escalate to cancellation department - Reverse accidental debit orders( the gentleman I spoke to said if it happens that my account gets debited they will refund me) What happened: - R1500 debited (NOT the agreed R500/month for 3 months) - 45-minute hold time for useless customer service call I wasted my airtime and after 45 minutes they did not even get back to me.