Payment reversal not being actioned

I accidentally transferred R6000 into Vodacom's account on the 28th of July 2015, upon which I called Vodacom legal departmet immediately. The lady I spoke to said I should email proof of payment so they would start the reversal process and that I should not bother calling back to check as the process will kick in as soon as they get the proof. I then forwarded the proof of payment. I called them on the 4th of August and I was told they hadn't received the proof of payment. I asked for an email address and Linda, the lady I spoke to said I should forward to her and that she will send to her supervisor who will speed up the process. I forwarded the proof of payment and I received conformation from her that she has received it. I call them today to check what the hold up is and I get told by the lady I spoke to that there is no proof of payment attached ? <br> My account with Vodacom has been handed over and I have an arrangement of paying R500 a month of which Ive been doing. This money was meant to pay for my debts and it was an honest mistake on my side. But now I'm being sent from pillar to post when a refund is supposed to be made. <br> I cant keep sending proof of payments...