incorrect information on credit bureau

This is the second complaint since the 4th March 2016, my account has been paid to date since February 2016, I even enquired with tracker and was advised that all is in order but up to now the last updat on my credit profile is December 2015 when my account was In arrears which reflects negatively on my transunion credit profile, I fail to understand what is it that I need to do in order for this matter to be rectified, if I am writing to the wrong person please advise