First, I’m an Avast user and not an Avast Team member.
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I suspect it is an attempted scam - If you look at the email details regarding the senders email address and reply address you may see it isn’t Avast.
The sum is absolutely massive even for 5 years if it was real. I don’t believe Avast do a 5 Year subscription, I think it is only 3 years. I also suspect the telephone number to be fake so I checked it out here.