A pure 100% scam. Just like the voice calls saying similar things, or "This Microsoft/ BT / VM support, there's a virus on your router, but we can sort it out if you just type a few things into your computer", or the email or web page messages "we've been watching you looking at naughty websites, and unless you pay a fee we'll blab it to your contacts", or "this is Amazon / Microsoft / McAffee etc we are about to take a direct debit for £558 to renew you subscription, press 1 to talk to a criminal...."
Email, text, voice....all of these scams are about creating a sense of doubt, fear and urgency for the victim, causing otherwise sensible people to do something that enables a bunch of crooks to hijack their identity and/or empty their bank account. If it sounds worrying, then always treat it as attempted fraud.
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