Suppression completely blocked — import stalls, list error, single profile fails too (free plan)

Hi everyone — I'm hoping someone has seen this before, because Klaviyo support isn't available on my account and the virtual assistant couldn't explain it.

My account is on the free tier (plan shows as canceled). I have 547 active profiles and 8 suppressed, and I need to suppress 439 inactive profiles (never ordered, never opened or clicked, created before August 16, 2026) to get under the 250 free limit.

Every suppression method fails:

1. Profiles → Import suppressed profiles: the upload stalls at 0.1% and closes with no confirmation and no error. Tried 6 times over Nov 14–15, 2026, with both CSV (one "Email" column) and TXT (one email per line). Counts never change.

2. Lists & segments → Suppress current members on a static list of the 439: after choosing "Manage costs" and confirming, a red banner says "This list cannot be suppressed." No further explanation.

3. Suppressing a single profile (Profile actions → Suppress profile): banner says "There was an issue suppressing this profile." No detail.

The virtual assistant confirmed suppression shouldn't require an upgrade, but couldn't confirm the cause of any of the three errors, and no human support handoff is available on my plan.

Has anyone run into this? Is there something about a canceled plan that blocks suppression, or another way to suppress these profiles while staying on the free tier? I don't want to upgrade.

Thank you!