STILL BLACKLISTED AFTER FINISHING PAYING AND GOT A CLEARANCE LETTER

I paid my account in JULY AND GOT THE PAID UP LETTER AND MY CLAERENCE CERTIFICATE.IM STILL BLACKLISTED BY YOU AND NOTHING HAS BEEN UPDATED AT THE CREDIT BEAURO.PLEASE ADVISE ON WHAT TO DO OR SHUD I GET A LAWYER TO HELP ME. CONSUMER FRIEND SAID ITS NOT THEM WHO BLACKLISTED ME ITS TRUWORT