I understand, and given two of the three available flights went out with 0 load in J at all, I would have thought it safe to assume there was availability.

Recall, I was originally told I would have to cancel my ticket and rebook a whole new one, which then changed to the web-site is mistaken, D class cannot change without paying a fee - ever.

The staff are incompetent or dishonest, they elected to go with incompetent.