Multichoice billing: very poor administration

Once again I have been debited the incorrect amount. I received a call from Duduzile Mthembu who even gave me her email address to raise issues if the debit orders went awry again. Of course they did, because this is Multichoice. Not only do you owe me a credit for the previous invalid amount on the debit order, but you have done so yet again. A credit was promised but not actioned, and now I am still being billed the incorrect amount. I have mailed you twice now, with no response after 3 days. If you cannot resolve, then hand it over to someone who can. Here is the reference number for the initial query. ***076577-i638