****** or Stuoidity

These people send you a threatening letter stating you owe them money with all the usual threats of handover etc. An account I paid off in 2017 gets sent to me again in 2019 and when they realise their mistake they withdraw the mail they sent you . Then you query this and send proof of payment again and you are totally ignored. They even acknowledge receipt of your letter or complaint. Now when I search for their reply they have recalled that mail as well!