As part of my economics degree course in the 1960s, I had to study Commercial Law. I was taught that according to the law of contract (not sale of goods) if any vendor advertises a product to the world at large, then that product must be as advertised. The case law is based on the famous ruling in Carlyle v Carbolic Smoke Ball Company. Your correspondent KR may not succeed in the small claims court, but he does have consumer rights against the vendor.