How IRS contact me?

Hello,

i was an international students from 2016 till 2020. I used TurboTax to file my taxes for 2019 and 2020, and i just knew that I shouldn’t have used TurboTax. Will the IRS contact me and demand to return those refunds? If so, how will they contact me if i moved overseas? 
I am planning to amended tax return, but just wanted to know if the IRS has been trying to reach me or not.