In California, companies must provide clear written notice of any material change to renewal terms and obtain consent before billing under new terms. Changing pricing from a staff-only basis to billing every user—without a new contract or notice—appears inconsistent with that law.

Telling you to ignore invoices, then demanding immediate payment with a threat of total service shutoff, could be construed as coercive and in bad faith.

Recommendations:

Put everything in writing. Send Salesforce/Slack a formal letter citing Cal. Bus. & Prof. Code §§ 17600–17606 (Automatic Renewal Law) and demanding they extend service during resolution.

Request a 90-day transition period to migrate, framed as reasonable and legally necessary under consumer protection standards.

Escalate to Salesforce legal/compliance. If necessary, copy the California Attorney General’s consumer protection unit.

Preserve evidence. Save all communications, invoices, and contract copies.

This doesn’t mean you should stop negotiating, but you have a strong basis to demand more time and push back on the sudden payment demand.