I agree a paper trail, but with the paper trail when you call them, you state "I am not rescinding the do not contact", but also remember this, connecting with a person, mild humor and references to other collection agencies will never be achieved by letters only.

Above all speeding up the process, there are always questions that are never asked or ever answered when you only use paper.

The point of Tactical Training is to change you from a number to a human/person.