Instagram Not Sending Me Verification Codes

I made Instagram with my personal email, but then later changed it to another email. I got emails on both of the email accounts about this change. Instagram has not emailed me on my personal email (first email) since that change. I am now trying to connect a Facebook account and change the password of the Instagram account, but for some reason whenever I try to do any of that, Instagram tells me to check for a verification code sent to the old email. But when I go to my email, I don't see anything from Instagram. Anything I try to change on the Instagram Account, I need to verify with a code sent to the old email. What do I do?