Paid-up Letter BAD SERVICE

Due to financial crisis, I was unable to pay 3 of my accounts, which was handed over to MDB. In May I contact MDB to settle the 3 accounts. The consultants confirm that after received the settled amount on the 28 of May 2019, I will receive the paid-up letters after 72 hours. I phoned MDB in the second week of June, asking for my paid-up letters, they told me the will send a request through to customer care for the letters. I phoned several times for my paid-up letters. This morning a consultant told me, MDB cannot provide me with a paid-up letter for 1 of my accounts, I need to contact Woolworths for the paid-up letter. Woolworths informed, they cannot assist me with a paid-up letter because the account was handed over to MDB. Once again I phoned MDB customer care and once again the response was, that an email will be send to the different consultants who is dealing with the accounts. This is poor service, how difficult is to send a paid-up letter to a client? How many times do I need to call for my letter.