Horrible customer service

So once again we have to come to Hello Peter. My complaint put on Hello Peter on the 21st November was resolved and I am thanking the people involved that helped resolved that. So once again Vodacom fixed/credited the double billing on our relocation invoice but December comes and Vodacom feels that they need to bill us again double. So basically I am sitting in the same boat as November, and once again I have had no reply on emails since the 7th December. So after 7 emails again no one seems to be bothered with us again. Vodacom is this so hard to see that it was credited and why on earth will you double charge us. Why must we come to Hello Peter to get Vodacom to actually help us. Like I said I am really fed up with this service. Also we dont have an active ref number to to Vodacom closing the case and then December comes you just bill us twice again and then when we try sort this you tell me this case is closed we cant help you - ref number was SR***