I am writing to express my deep dissatisfaction with British Gas. Despite not being a current customer, adverse credit markers were incorrectly placed on my file without any prior notice or communication. This action, based on outdated details from a previously settled account, has severely impacted my credit score and caused the postponement of my new mortgage. While I was initially assured that the matter was being addressed, weeks have gone by with no resolution. I recently received a notification stating that the case has been closed, yet the issue remains unresolved. The incompetence of British Gas staff throughout this process has left me no choice but to escalate the matter to the ombudsman and seek legal advice. I am extremely disappointed with the lack of professionalism and accountability displayed by British Gas. I hope no other customer has to endure such a frustrating experience.