If you use Malwarebytes (or even if you don't) then be aware that there are reports of a rash of scam email invoices at the moment.
https://forums.malwarebytes.com/topic/267733-fake-receipt/
It's just a tech support phishing scam, flag it as spam in your email app, then delete it.
If you should get one - Don't respond to it and definitely don't call the phone number.
Clues:
"Items :- Malware bytes secure system" (There is no Malwarebytes product of that name).
"Price :- $449.99" (Nowhere near that price - Mawarebytes Premium is $US 39.96, or £30 in the UK, for a 1 year, one machine, Home licence).