debit order

In January 2016,vodacom made 2 debits on my account,I called them to ask them whats happening and they said it's a system error but they will refund the one debit.I then said it's fine that the can go ahead.they then refunded both my payments,and never deducted my monthly debit of R500 of my contract.<br> <br> I call them again and they said the going to deduct the R500 which I must pay every month,which they did not do.<br> <br> Now they send me a statement that I must pay R1500,because of penalty fees because the payment did not go off which was not my fault in the first place.<br> <br> I'm very disappointed in there service,because I did not budget for a extra R1000 that I must pay for there mistake.