Most disputes are questions rather than refusals, and most are paperwork (missing PO, wrong entity) or scope confusion. The rule: stop reminders on the disputed invoice immediately, get the objection in writing, resolve or reissue within a business day, and restart the sequence from a fresh due date. Never let one contested line item hold up the undisputed balance.
In Reeve
When a reply reads as a dispute, Reeve pauses follow-up on that invoice and alerts you with a summary of what the customer said.