I'd be glad to help guide you to the right support so you'll be able to purchase a new charger for your iPhone chip reader.
To be able to purchase a new charger for your iPhone chip reader, I recommend getting in touch with our Merchant Support Team. In this way, they'll be able to assist you further securely and be able to purchase the item. For the support's contact information, you may check it here: Which Payments product do you need help with?.
You may also check these articles for further details about GoPayment card reader: