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Many furnishers have a standard policy of not deleting reporting based on payment of the debt. That is not an arbitrary policy on their part, as it is written policy of the CRAs, clearly stated in their credit reporting manual and incorporated into their reporting agreements, that furnishers should not report deletion based on payment of a debt.
So underlings are often bound by that standard policy statement. Just sending a GW to their general mailroom address thus may often be summarily dismissed by the underling under their standard policy.
Many have success by finding the name of a management official to direct their good-will requests, as management sets policy, and thus has discretion to grant exceptions.