Customer Service is not able to change orders once they are made. Another order must be created to add items, or the existing order can be cancelled altogether. This is included under our Terms & Conditions.
Amending Orders: No amendments to orders can take place once an order is placed. The only way to amend an order is to cancel the order (which incurs a 10% processing fee) and a new order can be placed.
I checked with CS and they had e-mail correspondence with you, but you did not agree to cancelling the order to create another. I'm not sure what else you require assistance with in this matter, but if you contact CS they will be happy to help you.