1. No provision of a retail installment contract or retail charge agreement shall be valid by which the buyer agrees not to assert against the seller or against an assignee a claim or defense arising out of the sale.
2. No act or agreement of the retail buyer before or at the time of the making of a retail installment contract, retail charge agreement or purchases thereunder shall constitute a valid waiver of any of the provisions of this chapter or of any remedies granted to the buyer by law.