The Direct Mark. Stay on the line while info is typed in. Call a month or so later to ask if you're listed. They have a legal obligation to deliver anything for which postage has been paid. Do not send back the Business Reply envelope, stuffed full of the junk, back to the sender.
Most reply mail goes to third party sweatshops for data entry.
Therefore, your effort to notify them in this manner will be for naught. Strike back when somebody has invaded your privacy. Notify the offending party that you're outraged and won't do business anymore. Insurance underwriters scan MIB files to decide how much to charge for a policy, or whether to even issue the policy. Page 184 Obviously, inaccurate data can be extremely harmful.