Incorrectly debited funds, and zero attempt from them to fix and refund this.

I had R17 incorrectly deducted from my top-up vouchers, twice, and so I am owed R34. After chasing this up with both Mr Prepaid and then having been directed to Prepaid Meters, I was told this was due to a system error and was being fixed. Having topped up again since, it seems the system error has been fixed, but I have still not been reimbursed the money. This issue is well over a month old now, and emails to them have been completely fruitless and unhelpful. I am not going to waste R34 in airtime phoning to chase this up. They have probably done this to hundreds of people who haven't noticed the extra charges, and are simply hoping it will go away. Dreadful service from this appalling company. I unfortunately have no option to use another service provider. And for this "service", we are are charged 10% of every single top-up. Absolute rip-off. Utterly mind-boggling.