VAT 0% for materials purchased in the EU?

I'm having problem with understanding if we should pay VAT in the EU ot get 0% VAT invoice: We buy materials (linen) in the EU which are then sewn into kitchenware, so the commodity code changes. Since UK left EU I understand that we pay VAT in the UK, but the linen supplier says they need to charge VAT already in the EU since the goods code changes. Are they correct? Thank you.