Just two little things -
1. I don't know where the OP tried to join the train or where they were going, but given the time of night that's alluded to in one of the replies, I would say that suggesting 'Just walk' is probably a little unfair - both for distance and safety reasons. And some people aren't aware that they can get a taxi instead, or rather don't understand the circumstances under which that can happen.
2. From experience, writing directly to a TOC is like throwing a bucket of water at a fish. It has no impact whatsoever, bringing at best a generic reply, but more usually just silence. When you complain via twitter*, most TOCs do respond because it's such a public forum. I would much rather enter into a civilised email exchange but they would not. Therefore, against my better judgement I go via social media.
*I haven't looked recently but in the past TPE studiously ignored any complaints posted on their facebook page whilst simultaneously thanking those who posted positive feedback profusely.