What do I do if I haven’t received my refund on the day of said it would arrive?

Where did you see that date?  Was it on the IRS refund site?

 

FROM THE IRS WHERE’S MY REFUND SITE:

https://www.irs.gov/wheres-my-refund

How it works

Where's My Refund shows your refund status:

• Return Received – We received your return and are processing it.
• Refund Approved – We approved your refund and are preparing to issue it by the date shown.
• Refund Sent – We sent the refund to your bank or to you in the mail. It may take 5 days for it to show in your bank account or several weeks for your check to arrive in the mail.

 

No, when I try to look up m refund on the IRS website, it does not show anything either. 

@Nialou28 The date that matters is the IRS refund site date.  If you do not have a date there, the IRS has not yet approved of your refund.  Continue to check on the IRS site.