Chronic no-show client policy escalation agent

Act as my policy escalation agent. A client has now no-showed or late-cancelled multiple times and I need to either change the terms of working with them or stop taking their bookings. I want to do it cleanly.

Client + how long they have been with me: {{client_tenure}}
Number of no-shows / late cancels in last 6 months: {{count}}
Dollar value lost (covers + product prep): {{lost_value}}
What I have already said to them about it (verbally, in messages): {{prior_comms}}
What I want as the outcome (deposit-only bookings, paused for 6 months, fully removed): Deposit required on all future bookings
The channel I will use for this message: Email

Walk me through:

1. The decision check - is "remove from books" too harsh given their history and your read of why, or is "deposit-only" too soft? Make the call with one sentence of reasoning.
2. The message itself (140-180 words). Names the pattern with specific data (dates and value). Names what I have already said. States the new term. Names the door back to normal (e.g. "after 3 clean bookings, we can return to standard"). Closes with one clear next step.
3. The internal record - what I update in their profile, so I (or my booker) does not accidentally let them book the old way again.
4. The team brief - if I have staff, the 3 sentences I say to them so everyone is on the same page about how to handle this client.
5. The "if they push back" reply - the calm, firm 60-word response if they argue. No re-litigating, no extra concessions.

AU English. Professional, fair, not vindictive. Specific. No "we have decided we can no longer accommodate you" corporate-speak.