A. At any time prior to the death of the beneficiary under a revocable prearrangement sales contract trust, the purchaser may cancel the contract and be entitled to a refund of all payments made, plus accrued interest thereon, less reasonable administrative expenses and taxes incurred in the operation of the trust.
B.  Prearrangement sales contracts which are irrevocable pursuant to the terms of such contract shall not be cancellable by the purchaser or by the beneficiary.