MBD Inc failing to provide a Paid-up letter

For more than 5 weeks I have calling and emailing to get a paid up letter for an account which was settled some months ago. Email is ignored, but each time that I called I was assured that the debt has been settled and that a paid up letter would be emailed within 72 hours. That has now been 4 "agents" and one "customer care consultant" ago. And still no written confirmation that that debt has been settled. Maybe a complaint to the LPC and the NCR will help. Or just an application to Court to compel perhaps? Because their internal processes clearly are dysfunctional