Unfortunately, there's no quick answer when quagmires like this ensue. If you saw the people who work at collection agencies, you'd know why.
To make matters worse, bureau personnel are instructed to perform only mock investigations in response to consumer complaints. For one reason, it costs too much to do actual ones. For another, most consumer complaints involve lies or errors. Why waste the money? Thirdly, consumers are only a nuisance to them. They are not there to serve you; they are there to serve their high paying collection agency members. That's why the bureaus invariably come back with a boilerplate "confirmed (as true) by investigation" response."
I've seen people walk into bureau offices with original account statements and supervisory staff refused to do anything. Even when they actually believed the consumer. Doesn't matter. Bureaus are there to serve lenders and their collection agencies. That's who pays their bills, not consumers.
Since the bureaus won't respond to consumers; you have file a complaint with the pencil pushers over at Consumer Protection on 5775 Yonge Street, Suite 1500. Include all the documentation with your complaint including up to date credit reports.
Sadly, much of the staff there appear lackadaisical, or not even on the consumer 's side - many years of leadership under Brian Pitkin has had its lethargic effect- but if you bug Kavanaugh, Manchester or Amana enough, hopefully they'll get on the bureaus' backs and tell them to fix the problem. You really got to get on their backs - and even then, well.....the stifling inertia is unbelievable. BTW, you have to file separate complaints regarding each bureau..
It's a pain going through CP but otherwise, you're dealing with the Philppenes - and good luck with that.