Train embarrassment

Having arrived at the ticket office at 09.00 I purchased a cheap day return. The booking clerk wrote 'not before 09.30' on the front of my ticket although I already knew the regulations. On my return journey, the ticket inspector took my ticket, held it up and pointed at me saying 'oh a clever one here, thought he'd get away with buying a cheap ticket and got caught out!'  I didn't understand what he was saying at first but he explained that the ticket inspector in the morning had obviously written the message on my ticket when I'd travelled on a train before the cheap day return was allowed.  I tried to explain that the ticket office had written the message and that I hadn't done anything wrong.  However, I was left embarrassed and uncomfortable for the rest of the journey.  I tried in vain to find the ticket inspector before leaving the train as I hadn't thought to look at his name badge during his assault.  I approached a member of the station staff when I reached my destination and explained the situation to him. He said that there was no way of identifying the ticket inspector as it was long distance train and anyway, he was probably stressed.

What protection do members of the public have when unfairly confronted by company staff and should the railway company have taken my complaint more seriously?