Can't help with who to complain to, but I to have had an issue with the
journey log being incomplete (both on the one visible online and the hard
copy that the Oyster helpdesk send out). I had an issue where I touched in
at Wimbledon but when I touched out at Fulham Broadway the validator treated
it as an entry (I never did establish why, possibly the validator had been
incorrectly configured as an entry gate rather than bidirectional?). So I
ended up with an incomplete journey from Wimbledon which just cost