We regret the delay due to the national Holiday in Vietnam for the Lunar Year. We had already replied to you in the chat support.
Try applying the code here: https://www.designbold.com/account/gift-code/mightydeals
As per our records, your code has already been redeemed by the email id: firstname.lastname@example.org
So, you would need to log in to DesignBold using the above email id to access your mighty deal pro account for a year.