Help me follow up on an overdue invoice.
CLIENT: [[CLIENT]]
INVOICE AMOUNT: [[AMOUNT]]
HOW OVERDUE: [[DAYS_OVERDUE]]
PRIOR CONTACT: [[PRIOR_CONTACT]]
Give me an escalating sequence:
1. Friendly reminder (assume they forgot)
2. Firmer follow-up with the due date and a clear ask
3. Final notice before late fees / pausing work
4. The line that signals consequences without threats
Keep each short and professional. Tell me the right gap between each.