Went shopping yesterday and saw a lovely man's top displayed with 30% off. It cost £60. So expected to pay £40. I was charged £42. This was a large, well known store. I queried it and I was told a confused story about 10% and something else. There was a long queue and I was lost by an explanation that he didn't seem to understand either so I left it. AIBU to think I should have received the offer displayed?