What device you are using to received the email? Is it a mobile phone or desktop. Maybe the problem is on the synchronization of your email account that’s why your mail is delayed. I can still access my account without any delay on email verification but sometimes I encounter this issue on different account when I’m using my old phone that slow on syncing my google account data.

What’s the support response to your issue? I believe they can’t do anything if the problem is on your mail.