With respect to a consumer credit sale, an assignee of the rights of the seller is subject to all claims and defenses of the buyer against the seller arising out of the sale, notwithstanding an agreement to the contrary, but the assignee’s liability under this section may not exceed the amount owing to the assignee at the time the claim or defense is asserted against the assignee. Rights of the buyer under this section can only be asserted as a matter of defense to or setoff against a claim by the assignee.