There are two places to look: your balance, and the log that shows where the credits went.
Your balance
Your remaining credits are shown in the main menu of the Twain app, bottom left. You can also find them under Settings → Subscription, along with your plan and renewal date.
The campaign log
Every campaign has a log of what actually happened in it. It shows:
who created the campaign
who generated which leads, and when
which mode each generation ran in
how many credits each generation cost
This is the first place to check if a charge looks higher than expected. Because credits are pooled across your team and the cost per lead depends on the mode, the log is usually enough to explain the difference on its own. A campaign generated on High costs twice what the same campaign costs on Base, and Ultra is charged per message step, so a long sequence adds up faster than a short one.
💡 Re-generating a lead in the same campaign and mode is free and will not appear as a new charge. Upgrading a lead to a stronger mode does cost credits, because Twain runs the deeper research and writes again.
If something still looks wrong
Reach out to support with the campaign name and roughly when the generation ran. Balances are tied to your account rather than to individual workspaces, so deleting a workspace does not remove credits.
For what each mode costs, see What is a credit, and how does it work? For how long credits last, see Credit Policy: Expiration, Rollover, and Usage Limits.