Laybye card issue

I have a lay bye account with the Foschini group. I had a number of lay byes with them, and took all of them out earlier this year. However, my lay bye account still reflects that I have a balance due to the retailer which is not the case, because I no longer have outstanding lay byes with them. The amount that is reflected on my account is not even attached to a lay bye that is in any of their stores. I have been to the Sandton and Midrand Foschini shops to try and rectify this problem since May this year. I have been sent from pillar to post with no help. Head office has been contacted a number of times in connection with this problem, yet the issue has still not been resolved after so many months. I have had this account for a number of years, and have been a customer with the retailer for a long time. I am very unhappy with the service I have received in the last few months, this is my last resort to try and rectify the situation.