"We owe you ____. Your credit balance will be refunded on request. If you don't request a refund, six months from the first appearance of a "credit balance" on your bill, your credit balance will be refunded automatically.
"If your credit balance is $1.00 or less, it will not be refunded unless requested, and after 6 months, it will not be credited against future purchases.
"You may obtain a refund of your credit balance by mail by presenting your statement at our store or by returning the top half of your statement in the enclosed envelope."
If between the sending of the first notice and the sending of the second notice required by this subparagraph, the outstanding credit balance is refunded to the buyer or otherwise disposed of, the sending of the second notice shall not be required.
Ca. Civ. Code § 1810.3