VODACOM NOT EMAILING INVOICES

In November 2014, Vodacom decided to stop e-mailing my invoices to me. For most of this year, I have tried to get them to e-mail my bills. I have tried over the phone reinstating email of invoices as well as querying at Sandton branch each time I paid my invoice as to why I had received no invoices. On or about 1 April, I also completed change of address etc form at Vodacom Sandton, and STILL no joy. As at 1 May 2015, the accounts department had still not updated the information. I changed my father's phone package in about February 2015. My father now receives sms updates from Vodacom ie talk time minutes and data bundle left etcetera. I do not understand why they have ceased e-mailing invoices and also changed the main number to which information is to be sent ie from my cell number (the account holder) to that of my father's (whose phone is also registered under my name).