Publishers Clearing House Scam: Do Not Be a Victim

UPDATE:
On the same day, I went to the PCH website and found a PCH Fraud/Scam Incident Report
which I completed and submitted. Today, I'll mail the original letter and envelop, as requested, to:
Publishers Clearing House
Attention: Darlene Federbush, Consumer Affairs
300 Jericho Quadrangle, #300
Jericho, NY 11753

Today, I received a FINAL NOTICE OF WINNINGS PAYMENT letter dated March 20th, 2023, from PCH, 101 Winners Circle, Port Washington, NY 11050, Winning number 383708. Contents in brief:
Congratulations on your winnings of $2,600,000.00. Payment arrangements: Contact your winnings claims agent JOE JOHNSON at 1-888-971-6608 for method of payment. You are eligible for a lump sum payout to your preferred bank account. It is mandatory for you to purchase insurance before delivery of your prize, to avoid default in taxes. The cost of insurance is $4,000 and must be paid in the form of a postal money order only. We do not accept personal checks, we only accept postal money orders. Winnings will not be delivered without payment of insurance.
Etc. etc.
Signed by: Mr. Miles Freeman
NOTE: The letter came oddly enough in an envelope with the following return address and was stamped in the UK by Royal Mail.
Leasehold and Right to Buy Services
London Borough of Hackney
Hackney Service Centre
1 Hillman Street
London E8 1DY
My question is: To whom can I send this letter for investigation? I called the above number for Joe Johnson, and both the number and the person who answered seemed authentic.

Here is another scam: "From: Publishers Clearing House sandrafalces@tim.it Sent: Tuesday, August 31, 2021, 06:53:46 PM EDT Subject: USA ©PCH Dear PCH Customer, We wish to inform you that you have won (Eight hundred & fifty thousand dollars)  in our PCH (email) winning draws. please email Beth Broderick for collection. Beth Broderick Publishers Clearing House Agent beth.pchofficer @ yahoo . com NY 10019, United States _ You are to establish contact with the Following details below Full Name_ Address_ Phone Number_ Thanks & Regards Mrs. Roberta Luca Alice Publishers Clearing House NY, United States To forfeit Publishers Clearing House, please unsubscribe"

there is another one about world life drinking water. usual scam method, 400 and they send you a check for 4 grand to cash made out thru post office check which is fraudulent. been there done that. learned my lesson.