That's not on and could be damaging unfairly.
The op says he ordered "on the condition that it was delivered in time for a planned trip on 2nd May." Then seems to have moved the goalposts to the 27th of April.
Then fallen out with them because that didn't happen.
In my opinion, if he changed the date and there were difficulties he is right to be annoyed, but it should have stayed private. At least until after the event-and the use of a totally negative headline should have perhaps been avoided.
I am not saying the OP is not right, but I think his method has too far reaching an effect. I.E. it (unintentionally) goes beyond his own particular problem.
Will they deliver on time? would have been a better headline, combined with an email to the company to point it out he had posted it.