"The entered license is invalid"

Incredibly frustrated with TeamViewer's service or lack thereof. I purchased a license weeks ago, received my confirmation email as well as the email with activation link however when I login it says I'm on a free subscription. I have my receipt and confirmation to prove that I did indeed purchase a license. When clicking the "Activate" button, a TeamViewer window opens in my browser with the notification, "the entered license is invalid". I've tried calling but apparently phone support isn't included. I've tried chatting but it's just a robot providing a link to the activation help, which does nothing for me. Would love some help so we can actually use this product, otherwise we may switch providers.