A rental-purchase agreement must provide that:
(1) any charge in addition to periodic payments must be reasonably related to the service performed; and
(2) a consumer who fails to make a timely payment may reinstate an agreement, without losing any right or option previously acquired, by taking the required action before the later of:
(A) one week after the due date of the payment; or
(B) the number of days after the due date of the payment that is equal to half the number of days in a regular payment period.