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The CRA determines the exclusion date, not the debt collector.
It is based on the DOFD that was reported by the debt collector.
The issue of what is the proper exclusion date depends on the accuracy of the reported DOFD, so the first step in determining the accuracy of the exclusion date is to determine the accuracy of the current DOFD of record.
I would begin by determing the currently reported DOFD.
If not shown in your commercial credit report, you can likely obtain it by viewing your report on annualcreditreport.com
If inaccurate, you can dispute the accuracy of the reported DOFD, which will then result in correction of any inaccurate exclusion calcluation.