You don't give much information to work with, like the product purchased and when, however this link is a good start.
Sales change order details wrong email address given, etc. - Submit a support ticket You could try this to see if sales can track down your order - Submit a support ticket
https://support.avast.com/en-ww/contact/sales_other_general#pcGive as much information that you can to help track down your payment and reissue the license if it has gone to an incorrect email address.
For example, how did you pay, the Product Purchased, when purchased estimated date, location/country and currency used, if you think you made a typo, it is likely to be close to your actual one. The more information you can give the more likely it could be tracked down.
