Unable to recieve Tax Invoice

I am struggling for almost 2 years now with Vodacom just to receive my monthly Original Tax invoice and statement. I have an official cell phone and therefore need the ORIGINAL Tax invoice to submit to my employer for the payment of my cell phone allowance. Ever since we moved and I had to change my address it is seemingly impossible for Vodacom to provide me with my correct statement and invoice. Each and every month I had to phone the call center in order to get my Tax invoice but they can only provide me with a COPY TAX INOIVCE which make it impossible for me to claim it from my employer. As a last resort I visited the Voda World in Midrand but not even Nontutuzelo Booi could successfully resolve my problem. At this stage I don't receive any statements or Tax invoices at all. Now I have to call the call center again who can only provide a COPY tax invoice which I can not use to claim my cell phone allowance. I am so sick and tired of this struggle I can not take it any more. For almost 2 years now, month after month after month it is the same struggle. Is there anyway I can resolve this problem?