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If you pay with the original creditor and file a dispute, they have to remove it.
Paying the OC does not create any inaccuracy in the reporting of the collection, and thus there is no basis for a dispute.
CRA policy is that debt collectors should NOT delete their collection based on payment of the debt.
Thus, in addition to there being no inaccuracy upon which to base a dispute, requesting the CRA to delete based on payment of the debt is asking them to act contrary to their clearly stated policy.
The OC must terminate any assigned collection authority prior to receiving payment in order for any CRA deletion policy to be present.