As I said before, this is a theme and all icons are made manually and added in every update. If you bought Darker you can request icon here.
If you request icons such as international banks, international telephone/internet companies such as Vodafone, you can change your icon using Snowboard. Edit your homescreen, double tap in the app and change your desired icon.
If you have Snowboard, edit your homescreen, double tap in the app and change your desired icon.
You can always request a refund at repo.packix.com/account if it hasn't passed 7 days since the purchase. Remember that once the theme is refunded, you CANNOT buy it again and there will be no updates.