When Tenant calls and tell you they will be Late on Rent

[Joey Fontenot III]

I have had a tenant call and tell me he will be paying his rent 2 days after Rent is Late. (Late on the 6th, says he will pay on the 8th). I have told him he needs to pay by that day and pay the late fee. If he fails to pay on that day, I will be placing a 7 day non-compliance warning for termination of lease on the front door and document this through pictures. I want to be firm, but still be as smart as possible about my approach to this kind of situation.
What would be your response to this situation when you have tenants calling your phone and telling you they will be late on rent?

Thanks,