Hello and welcome to the forum.
I am sorry to hear about the problems you are running into.
The first step would be raise the problem with Audio Plugin Deals; issuing valid unused Serial numbers is its responsibility.
Please contact
Sales/Account Support, via here and let them know of the problem. You will be able to search the FAQs first, but if they do not resolve your issue, there is a link at the top to a Support form. Sales Support can look at your Account and see what's going on. Response time normally is within 2 working days (US (East Coast) Business hours, generally), but in the current circumstances please allow some more time. Administrators and Moderators here cannot access your Account.