I have asked them about it, after you replied.
Since for us this will be 2-3 times fee, it's not a significant expense but you are right..
Now I know what to do in the future with similar bills and invoices. For example, we have an invoice for Adobe Creative Cloud, Google Ireland (Ireland VAT number on the invoice but they didn't register us as company user so they don't have our VAT number).
After your reply, I have also contact them to fix that. Thanks to you, now I know!