How do i get the old version back

Hi. This new update ticked me off literally as soon as I saw it. If I wanted limited customization on my phone I'd get an iPhone. Get this chat crap off of my messages area. 1. Its advertisement! UNWANTED ADVERTISEMENT ON MY PHONE THAT I PAID FOR! 2. This update slowed down my phone exponentially. Complete and utter crap. Give us a choice! I will NEVVEEEERRRRRR use that chatbot so give us a choice to uninstall it!
Bottom line, I want to get rid of this update after not even 5 minutes. How do I do that?

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