As a provider of electronic services, CargoX is required to charge VAT at the rate from the country of the buyer. You can read the explanation here.
If you already have a pro-forma invoice, but have not yet paid, you can safely ignore it. Unpaid pro-forma documents will be automatically removed from your account 60 days after they are created. After you complete the VAT verification, just create a new purchase to receive a new pro-forma invoice without VAT.
Unfortunately, we are not allowed to change/amend already paid invoices.