Can't log into account

So today my computer has given me many issues, so i tried to get into my avast. I bought two years of it and it says 0 days left of my subscription so i tried to log into my account and now it says that they don’t have my email for the account which i still have the email for my purchase which has my email on it. So i was wondering if anyone knew what was wrong, sorry if this post doesn’t make sense I’ve been restoring my computer for about 3 hours after the re-install of avast crashed my computer so if there is anything that could help it would be appreciated.