I do have to ask, the guidelines that you posted were "You must sit at the BAR TOP for this shop. If you arrive and there are no seats at the bar, please place your order with the bartender. If no seats open up within 15 minutes, you can then sit at a table close to the bar top. Please note this information in your report".
Did you place an order with the bartender before you were seated?
I have worked for this company, and find them to be very reasonable in their expectations.
I understand that some of the members of this forum tend to come off sounding a little rough, but they have seen posters come here just to grouse about a perceived slight-so please do not be offended if they do not "agree" with your post.
If you call the scheduler or even email the editor, they can point out exactly why the report was rejected. It will be in the guidelines somewhere. As others have pointed out, it could be the amount of time you waited, or the place you sat, or where you actually placed your order.
Each of us has our own expectations of what we want or need from a company. We can pick and choose which ones we have relationships with. Sometimes, it takes a few issues to come to the realization that a company is not a good fit. This does not always mean the company is bad, but it is just not a good fit for you. IF you like what they have to offer, try to get this resolved, and understand that it may be a "wash" if the guidelines had specifics pertaining to this circumstance. Although you may not intend to spend certain money on a meal-always go into an assignment understanding that it is a risk and you might not get the money back.
If you like this kind of work-Keep your chin up and soldier on.