African bank undermining administration settlement orders

2011 June I put all my credits to administration I got the court letter to give to all my creditors which include african bank last year I got the letter from my administration stating that all my creditors are paid and I got the letter from the court again stating all is settled, right after that african bank stated calling me after after 9years saying I need to pay them 7800 I told them I got a E74 stating all my creditors from administration are settled they said I should take take letter to my nearest african bank which I did to two different branches, even today they call me 4 to 5 times a day saying I still owe them this is really stressing me now and disturbing me at work you keep on saying the same thing but nothing changes