I'm being scammed and I don't know what to do.

[Not Heidi]

I rec'd an email from a Sue Chez* which begins:

"Greetings,
"I trust this email reaches you in good health. I'm pleased to report that the trade we talked about has been successfully concluded. The essential information can be found in the attached PDF."

I've never talked to anyone about any trade. With trepidation I opened the PDF. It is an invoice ostensibly from Norton Antivirus, stating that by auto debit I am paying $899.99 for subscription renewal.

I've never subscribed to Norton. I called the number on the PDF and got a guy whose first language is not English. First he argued with me, trying to convince me that I did indeed renew my subscription. Once I shut him up about that by insisting several times that I never subscribed to Norton (and I was growing increasingly rude, I confess), he said to go to this site: getmefixed.tech. I googled "getmefixed.tech scam" and this opened scam-detector.com -- which promptly froze.**

I asked the guy his name; it's "Mick Brown." I told him I'd have to call back when my computer stopped freezing (my computer is fine). He gave me his direct line -- and I hope someone else answers.

Friends, please help. What the hell do I do?

* I googled "Sue Chez" and found there are about two dozen businesses called "Chez Sue." What a coincidence, eh?

** This is what it froze on:
"www.scam-detector.com
"Connection is secure
"Proceeding..."