Vodacom *****ing my money and calling it an error !!

What kind of pathetic service are you running there . Last month you said you made a billings error and you would credit my account this month but you debited that exorbitant amount again this month. You failed to call me and clear the air the last time now you did the error again. This is money I could be using for something else . Do not credit me , I want a refund in the same account that you debited me from !!!