It might not be enough to get them to stop immediately, but it's also useful for several other reasons. It is usually a necessary first step in a real small cla

It might not be enough to get them to stop immediately, but it's also useful for several other reasons. It is usually a necessary first step in a real small claims action against them. It's also evidence if you're dealing with a more serious case and want to take formal action over harassment, file for an injunction, demonstrate that the amount is in dispute to make debt collectors go away, etc. Basically, not acting properly on mail sent to your registered address will likely count against you in any sort of subsequent legal dispute. One thing that I've known several people to do (with considerable success in practice) is include a statement in that letter to the effect that sending that letter is free of charge, but any subsequent actions you reasonably take due to the company's incompetence will incur a clearly stated and proportionate administration fee and/or require compensation for any expenses incurred and other consequential losses. As I understand it, as long as you're reasonable in what you say you'll claim from them, this can be legally enforceable, particularly if the business imposes similar conditions itself as part of its contractual terms, which many do. Certainly I've seen several major businesses end up paying out a small amount of compensation in these situations when the matter was finally settled. This can also be helpful for getting a problem escalated to someone who can deal with it sensibly, because random front-line customer relations staff probably don't have the authority to incur expenses on behalf of the business.