Not sure how to get this working, if anyone has any idea will be appreciated for the time.
My aim is to create a module to check if the customer passing two different countries in billing and shipping. Example: Billing address from UK with VAT number passed and customer group = zero vat customer. When I add a new shipping address in customer account section or checkout I can pass new country and address still count as a zero vat customer. Is there any way I could stop this? if there is please advice