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Act as a credit-control advisor for a professional services firm.
Write a polite, 3-tier sequence for an unpaid business advisory invoice:
1. Day 7 Overdue: A light, friendly check-in assuming the invoice was simply overlooked in the accounts run.
2. Day 14 Overdue: A firmer reminder asking if there are any billing queries and re-attaching the payment invoice.
3. Day 28 Overdue: A formal notice advising that work on upcoming project deliverables will pause until the account balance is cleared.
Operating rules: Professional, courteous, and commercially firm. Protect the long-term client relationship. Use hyphens only.