This was the offer, when you downgrade plans, your account is subject to the credit rollover policy of your new plan. For example, if you have 20k credits and downgrade to a plan that allows up to 5k credits, your workspace will have 10k credits when the billing cycle resets, so some credits will be lost. In your case, I can add all the credits back after your cycle resets so you have an extra month to use them.