BIS Technical Issues

Every month since December 2015 I have had an issue with my contract where the BIS gets cancelled every month end and it is most frustrating and annoying and nothing is being done about it and the call centre advises that it has been escalated to the technical department and i have to wait 48hours. It is pathetic service as I pay my account on time every month and Vodacom does not honor there contract agreements. Should they manually over ride the system and activate the BIS i get over charged each month and that is another nightmare to rectify as we have been waiting for credits of the last 2 months having been over charged. I cannot believe how the service of Vodacom has gone down over the years. I have been a customer since 1985 :(