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> How to dispute an emnify invoice within the objection window, when credit notes are issued, and how to offset a credit note against future invoices

If a charge on your invoice looks wrong, raise it with Finance in writing.
emnify issues any resulting correction as a credit note.

## Dispute an invoice

Send an email to `finance@emnify.com` with a full overview of what you believe is incorrect and why, so that Finance can investigate.

Under Clause 6.7 of the emnify Terms of Sale, objections must be:

* Raised in good faith
* Made in writing and substantiated
* Submitted within 30 calendar days of receiving the invoice

You can withhold payment only for the disputed portion of the invoice.

> **Tip**
>
> If your question is why usage is higher than expected, rather than whether the invoice is correct, start with [Reports](/portal/reports).
> [Usage history](/portal/reports/usage-history) and [Usage per device](/portal/reports/usage-per-device) often explain a spike without a dispute.

To ask whether collection activities can be paused while a dispute is investigated, contact your Account Manager.
See [Collections during a dispute](/portal/billing/overdue-invoices#collections-during-a-dispute).

## Credit notes

emnify generates credit notes with the billing cycle, once a month, at the beginning of the following month.

### Credit notes in the emnify Portal

Standalone credit notes aren't shown in the emnify Portal.
Contact `finance@emnify.com` for the document.

### Offset a credit note against future invoices

Contact `finance@emnify.com` to have a credit note offset against future invoices, so that Finance can set up the offset in the emnify accounting system.