None service supplie

My wife and I have tried to sort out our account with Vodacom for the last 5 months. We have tried switching contract to prepaid and been sent from one department to the next with no result. We have paid up all contracts and chharges, we have paid to have us switched to prepaid and every paymet Vodacom asked for. We have sent all the documents asked for via email and fax several times and every time we enquire no one knows anything. We have been to three differant Vodacom shops, every time promised that this time everything will be sorted. Till now, NOTHING!!!