I don't know whom you have contacted, you could try this link and follow the potions closest to your issue.
Sales change order details wrong email address given, etc. - Submit a support ticket
https://support.avast.com/en-ww/contact/sales in your case select the Billing, payment, or license issues option.
1. Select the 'I need help with a different subscription or billing issue' option and click Next.
2. Now select email as the telephone option is USA.
3. Enter your details and give as much information as possible - even a link back to this topic.