Poor Customer Support

I contacted Vodacom to have my surname (which had been correct before, but someone had changed without consulting me) on my Invoices and Statements corrected. Call number *** was duly logged. <br> <br> I provided Vodacom with the correct details, including a copy of my ID, as requested.<br> <br> The call was closed on 29 March 2016.<br> <br> On receiving my new Statement and Invoices, however, I note that not only was my surname now incorrect on ALL the invoices and statements (where before, some at least were correct) but some additional and incorrect address information was now also included.<br> <br> This was not the first time I requested Vodacom to correct my details.<br> <br> It is a poor reflection on Vodacom and the competency of their staff if my personal details may be changed without consulting me and when I request to have it corrected, that the staff in question are incapable to extract the correct information in spite of having the information provided to them (e-mail and copy of ID) and then furthermore, choose to append information (incorrect address details) to my statements and invoices.<br> <br> I have tried to use their online chat-service a number of times to address this problem, but no-one respon