(1) Rights under a guarantee shall not in any way exclude or limit the rights of the buyer at common law or pursuant to statute and every provision in a guarantee which imposes obligations on the buyer which are additional to his obligations under the contract shall be void.
(2) A provision in a guarantee which purports to make the guarantor or any person acting on his behalf the sole authority to decide whether goods are defective or whether the buyer is otherwise entitled to present a claim shall be void.