Incorrectly flagged as business prepaid customer

Since the beginning of August I have been incorrectly flagged as a business pre-paid electricity customer and as such are paying a much higher rate then private consumers. I have been trying to get this sorted for more than a week but to no avail. Their call centre number does not work and stays engaged all the time.<br> I managed to get through to a person called Gugu who promised to help but she is not available anumore.<br> This is really frustrating as I am paying more than I am supposed to for my pre-paid electricity.