obstacles obtaining tax invoices

After a week of emails to customer care, MANY phone calls to the call centre, and a manager at the call centre, 4 lengthy visits to the Key West Vodacom branch speaking to staff and the manager, managers at *** (who just wanted to refer me back to the customer care line again!) I was told he would contact me. Several hours later he had not phoned back. I have been unsuccessful in obtaining simple TAX INVOICES. I have instead received STATEMENTS for one account on 5 occassions! Staff do not know what the difference is between an Inovice and a Statement. On one occassion I had a long discussion explaining to the call centre lady what the difference was between an Invoice and a Statement. Finally she understood and started sending some invoices. There, are however, quite a few Tax Invoices which I still require urgently. Strangely, I requested the same kind of info from MTN and TELKOM in the Key West Branch and on both occassions I received the emails on my phone before I had even left their offices within 5 minutes. The Telkom Invoices I received were a total of 86 pages! I have all the info to verify my statement