You might be able to change the language the game uses, if the store you bought it from offers an English version. You'll need to do a web search for the store to see what languages they offer.
From what it sounds like if they offer multiple languages, but you can't find English on that list, you can uninstall the game, and change the language in Origin to English. You'll need to restart Origin.
Reinstall Sims 4 and it should be in English. - This is if English is offered where you purchased the game.
If you see that they don't offer English, you might be able to get a refund and can purchase it from AmazonUK, like Jpkarlsen mentioned.
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Reference Link:
How do I change the language in the Sims 4?
https://answers.ea.com/t5/Technical-Issues-PC/How-do-I-change-the-language-in-the-Sims-4/m-p/3440399#M6420
