When you have spent all of your credits to participate in ongoing exchanges, you may temporarily have 0 credits.
There are other situations where you may find that all of your previously earned credits have been rolled back and you have -1 credits. This occurs when you have an unfinished exchange for an excessive amount of time. If this is the case, please log in to Reddit Gifts and check your credit breakdown from the Manage Exchanges page to see which exchange may not be completed.
Please make sure you have followed all of the necessary steps to complete the exchange, including marking your gift shipped and sharing your gift in the gallery or reporting no gift. Even if you were rematched and posted a gift from your rematch Santa, you will need to report no gift for the original exchange if something went wrong.
Please note that the gift status information page may show everything as completed after a certain date. Be sure to use the credit breakdown page to see what is and is not actually completed.
If you still need help, please contact firstname.lastname@example.org.