Bad service from vodacom

To whom this may concern.

I have been a valuable customer to Vodacom with a few contracts for a few years now, and I'm highly disgusted with there service and unprofessional mistakes they make, my account was debited twice even though Vodacom did say they would keep it for a credit for the following month its unacceptable for me a credit on the next month is not going to put food on my table to feed my family the current month they made the mistake???? if the customers bill is not paid with a doubt the phone gets cut but as Vodacom makes a mistake the double debit just gets kept for the next month but how am I meant to pay other bills and feed my family? its just to easy to say put it over as a credit because its to much work and effort to do the customer a refund? i want to know how has this matter been dealt with internally has there been a warning given? to avoid future situations like this or else I'm moving to a different supplier.