How do I stop the messages I send with koodo from being viewed on other devices? I linked my phone number with the wrong email

So basically i have a temporary koodo phone plan on my iphone se. The only problem is that when i signed up for it, instead of linking my email with the number when i signed up, i linked my dads. Now, my dad is able to somehow read my calling and texting history. I'm not sure how this is possible, i don't know if it's because it emails him all my texts or if he goes on the koodo website or what. All i know is that my dad is able to read my texts, how can i solve this problem? Like is there some way i can go on settings and have it so that my texts only stay on my phone? Annoyed.

Ok