If the plan you purchased costs less than the plan you wanted, you can change it yourself to the correct plan via your account page without it costing you anything.
If you need to switch from a monthly or annual Minecraft to Roblox account (or vice versa) you can follow this process. Please note these screenshots were taken some time ago, reflecting previous years.
On your billing account, select the plan tab to view your current plan. Select the "Change plan" button. If you don't see this option because you cancelled your plan's auto renewal, just click "Reactivate plan" to turn back on auto-renewal to get this screen to appear.
You'll automatically be shown your upgrade options. However, you should select the tab for which account type (Minecraft or Roblox) you want to switch too.
Select the option you wish (Minecraft/ Roblox & monthly/ annual). Then simply checkout by clicking the green pay button. Do note, when you switch a subscription, your plan won't charge you until the next payment date. The pay button will reflect a date in the future, which is your renewal date, but the change to your account applies immediately.
If you have a lifetime plan you need to switch, please contact customer support.
If you want to upgrade to a family account, you can do so via the plan tab on your account page found at codekingdoms.com/account/. You can't downgrade a monthly family plan to individual. If you want to do this, you are best to cancel that subscription and sign up again. Let customer support know so they can refund your original account.
If the plan you purchased costs more than the plan you wanted, let us know and we can arrange a partial refund and downgrade your account manually.