Poor service

I was handed over to this company due to three of my retail accounts that were behind with payments namely Foschini, Woolworths and Identity.I then arranged and managed to pay off all accounts a month and half ago.Since then I have been calling asking for paid up letters to show that I am done with these accounts but till of date I ahve received nothing.I have made numerous calls to the company and each time they just confirm my email address and tell me they are requesting the letters but somehow these letters never reach me.It really has been a frustrating experience as I spend airtime trying to get through to the call center but never get what I called in for.What does one need to do in order to receive the letters because they can surely see from their system that all accounts are fully paid.Kindly assit