Credits typically don't vanish after a trial expires. If you received 3000 credits through a referral program, there are specific requirements for these to be applied:
1. The referral link must be used correctly during signup
2. You must become a paying customer to activate the credits
To resolve this, please verify if you met these conditions. If you believe there's an error, you can fill out the form at https://clayhq.typeform.com/to/pV2u1kxs to request assistance with your missing credits.