RCS - unable to get a settlement letter months after closing my account.

In September 2020 I settled my Edgars. Getting RCS to acknowledge my request has been the hardest thing. I was called in August that I have an outstanding amount that needed to paid out to Edgars and was advised to pay. After settling the again in November I am not getting any satisfaction. I have been trying to get a settlement letter since November with no success. I have called NCR four times requesting the letter and every time I am being told the letter will be sent in 24 to 48 hours. I have never received the letter. Please assist .