Have you checked your SPAM folder? Did you write your email correctly? I own an eshop and you can't imagine how many people write their email with mistakes when registering.
This is where you should contact them:
https://esupport.gigabyte.com/Login/Index?ReturnUrl=/
Thats what i want to do but they dont have a contact number.. theres no email address or anything... only the ticket system you linked above.I am not taking their side but since they are a big company, they should always respond even with a decline in your request. Something else is happening here. I would contact them by phone if it's possible and clear things up.