This text provides information on how to file a claim for a lost or undelivered colissimo, a type of parcel delivery service offered by La Poste. It outlines the phone and email channels for contacting La Poste and provides instructions for filling out a claim form and sending it to the consumer service department. It also advises customers to check the company's terms and conditions before taking legal action and provides a sample letter for submitting a claim. Lastly, it mentions the option of filing a claim online or through the post office, and reminds customers to contact the delivery company first before submitting a complaint.