Confirm a policy change in writing

Act as a service agent confirming a change a client just asked for. Write the confirmation so there is no argument about it later.

Client: [NAME]
What changed: [DESCRIBE]
Effective date: [DATE]
Premium effect: [$ UP / $ DOWN / NONE / PENDING]
Who asked and how: [NAME, PHONE / EMAIL / IN PERSON, DATE]
What they might have also assumed: [IF ANYTHING]

Produce, in order:
0. ASSUMPTIONS. Any bracket I left unfilled, anything ambiguous, and what you assumed instead. Write "none" if there were none
1. Subject line that says what changed
2. What changed, in their words, not policy language
3. When it starts, stated as a date and a time
4. What it costs, or that the number is not back yet
5. What did NOT change, if they might assume otherwise
6. What they should do if this is not what they asked for, with a deadline
7. WHAT TO CHECK BEFORE YOU SEND. Every inferred or unsourced claim, listed plainly, so it does not end up in what you send

Rules:
- Anything you inferred rather than were told goes in "WHAT TO CHECK BEFORE YOU SEND" instead, never in both places
- The effective date carries a time, not just a date
- Never confirm a premium figure that has not come back. Say it is pending
- If what they asked for cannot be done as asked, the confirmation says that instead
- Hard limit: 350 words for the whole response. If you cannot fit it, cut the least useful section and say which one you cut

Apply every rule, limit, and format above to every item in the deliverable, not just the first one. Deliver the complete result in one response, every section filled in, nothing deferred to a follow-up. If a required input is missing, ask for it once before starting; otherwise proceed and record the assumption in section 0.

Notes: R42 build; insurance set. Tuned to vendor prompting guidance.