Paid up letter request

I recently paid up my vodacom account in full to the lawyers and when I called them on the 3 Jan they advised me to call Vodacom requesting a paid up letter. It took me almost 2 hours to get through to them as I kept on being transferred to different departments. When I eventually did get hold of a lady she told me that she would handle my request and i would receive a clearance letter on Friday the 05/01/2018. I am still waiting for this emailed letter to this day and it is such a pain getting hold of this company which takes airtime as I am no longer a vodacom customer. They were quick to hand me over but now that my account has been settled it seems like a mission for me to get my letter.

Please assist me.