Discuss the validity of each bill of exchanges based on Bill of Exchanges Act 1949 and related cases.(Malaysian law)

i. Robinson is a drawee. He received a bill of exchange, signed his name and wrote "accepted" on the bill. However, after payment has been made from his account, Robinson denied his responsibility to make payment and demand him money back.

ii. Mark is a company director. He suffered deformed forefinger during a road accident. To validate his company's bill of exchange, he used a rubber stamp to replace his signature.