Terrible service

Three moths ago I had to settle a SABC account. I was sent numerous email from MBD and I called them to settle this debt. They arranged a discount on the amount owed and they told to pay the R1,570.00. I have called them numerous times and also sent emails to a lady called Vivian. She does not reply to her emails and every time I call they said she is busy and she would call me back. To this day, 3 months later, I have not received a call. I'm wanting my PAID UP letter sent to me. I feel that they withholding this letter from me so they can call me up one day and say I owe more money. I have read many bad reviews about MBD and that they are ***********. I am starting to wonder if they are a ****?? I want someone to contact me and explain why I don't have paid up letter.

Regards Clive