vodacom is failing 2 provide me wit a paidup leter

I settled my Vodacom account on the 15th of June 2015 and I called them on the 18th requesting a settlement letter. The response I got from them was that, it will take 48hrs for me to get the letter and on Monday 22nd I called to make a follow up on my request, I was told that I must wait until Tuesday 23rd. on Tuesday I didn't receive the letter, I called to follow up on the matter again and I spoke to a different person and she told me that she will make another request because she sees nothing o the system, it will also take another 48hrs for me to get the letter. I waited until Thursday and when I called I was told the same story that there's nothing appearing on their system. I was advised to wait for another 24hrs and given this reference number s3-88196-67-et.