User able to change country

Hi – I have this set up and it seems to be working great except for the fact that the customer can change their country to whatever they want and there is then nothing stopping them purchasing – the EU vat info on the purchase history then shows the mismatch, but how can I stop them doing this ? Can I ‘hardcode’ the country for tax purposes based on IP ?

https://www.ads-software.com/plugins/edd-eu-vat-compliance/