214.8. If the consumer unilaterally cancels an indeterminate-term contract, no cancellation indemnity may be claimed from the consumer unless the merchant gave the consumer a rebate on all or part of the sales price of the goods purchased in consideration of the service contract and entitlement to the rebate is acquired progressively according to the cost of the services used or the time elapsed. In such a case, the cancellation indemnity may not exceed the amount of the unpaid balance of the sales price of the goods at the time the contract was made. The indemnity decreases as prescribed by regulation.