Very Disappointed.Very Upset.Actually heartbroken

I'm very disappointed by the way that I've been treated by my local virgin active club. Virgin Active should not have accepted my application for membership to begin with if they had an issue with me. When I registered for membership mid-July, Lesiba was more than happy to register me and I've been accessing the facilities with no issues and then when I go into gym this week, my access has been blocked because my membership is apparently \not authorized"because I apparently owe some R5000 odd from my previous membership 10 YEARS AGO. When I contacted Virgin Active laywers"