If you had credits in your account, they were automatically applied to your next booking. So, if you had credits, and then you had a booking, they were applied to that cost.
Haven't had any bookings? Something might have gone awry. Get in touch with our customer support team to get this sorted out - firstname.lastname@example.org.
To check your SweepCred balance
Visit: Account --> SweepCred, you'll be able to view your balance under 'Current Balance'.
To top-up your SweepCred
Visit: Account --> SweepCred, and work your way through the step-by-step process to purchase SweepCred.