So, two clear NRT signs, and the video shows you stopped by them indicating to turn right, which you then do. It's difficult to see how you could have missed these and you haven't given us any reason for not obeying the sign.
All you can realistically do now, is wait a bit until others have looked and maybe seen a "technical" issue related to the PCN itself. Don't just cough-up now, it is important that all avenues are looked at, and anyway we always recommend submitting reps so their reply can be examined for fatal errors