The problem maybe occuring when the creditor reports the account every month to bureau. Does late reappear shorly after your monthly billing period ends? Check to see if you can find when the account was reported IE month day year. Is there any correlation between that date and your monthly billing period. If so talk to the creditor and have them fix it. It sounds like the creditor is fixing your account manually witrh Trans Union but not fixing how they are reporting it every month to the bureau.
Let me take this way from your problem hopefully this might help clarify what I just said. Let us say you create a spreadsheet report from some information stored in a database. Someone calls you and says the spreadsheet as an error you agree and fix the spreadsheet. Unless you go back and fix the data that is incorrect in the database the next time your create that same spreadsheet rport the same error will occur. The spreadsheet is the data being given to TU the database is the source of the data given to TU unless you fix both places the problem will keep reoccuring.
I hope this helps
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