A few years ago I bought a sixpack of Sam Adams Oktoberfest that was obviously bad-it tasted like soured Budweiser. I sent an email to them, that afternoon somebody from the brewery called me and asked for more details about thee brewery of origin, bottling date, etc. A week later I got a check for $25 and a Sam Adams glass. OTOH I bought some infected bottles from a brewery in Arizona, I emailed them twice and never heard a word from them.