Paid up letter.

Last week called Vodacom, in order to get a paid up letter, only to find out that I’m still owing that contract, I was never contacted for that. I paid the outstanding amount neither less , and requested for a paid up letter, the consultant on the phone reassured me that the letter will be received within 48. I waited for 48 hours no letter was received. On Monday I took upon myself to call again to ask about the letter. This time the consultant on phone assured me that he is escalating the matter and I will receive the letter end of business day. I didn’t receive anything. On Tuesday I called again to ask about the letter I was told that they have escalated my matter and a leader will contact me. On the very same Tuesday I called again I was told by different consultants now that I’m only going receive this letter after 7 days.It’s Friday as it stands no letter has been received or even a call from a leader. I just a letter that’s it. I’m very confused on is suppose to happen and I’m very annoyed with the service I'm receiving from Vodacom. I’m being sent to pillar to post.