The oil change shops I have done for Service Sleuth always say to ASK if they have your filter in stock when you make the preliminary phone call to check their telephone customer service, not to just show up. Did your shop not require the same-day phone call?
You might have called a dealer for your car. The oil change place may have HAD the oil filter you needed, but it was too new to be on their specification charts. The dealer would know if the filter for the 2014 Subaru Forester happened to be identical to the oil filter for the 2011 Outback, for example (I don't know if it is or isn't, I just know the 2014 Forester is a different animal than the 2013). In that case the store may have had the right filter but had no listing telling them that, but the dealer would probably know it.
I'm sorry you had a bad first experience with them. Mystery shopping is a very precise undertaking, every detail is important, every instruction must be followed.
If that was NOT the case, and you were NOT required to make a call and ask about the oil filter, I would appeal this to Samantha, and explain that you followed the directions, and did everything you could to make the shop happen, but it isn't your fault your car was too new to get an oil change anywhere other than at its own dealer yet. Tell her you did not flake; the store was not stocked to handle all vehicles. Ask her to please remove the flake notation since you did everything you could to bring off the shop.
Who knows? Maybe she'll do it.
My gut (having just done one of these shops YESTERDAY) is to think you either didn't make the call, or forgot to ask about the filter and THAT was the reason for the flake notation, not the fact that your filter hadn't been invented yet. But I could be wrong if you weren't shopping the same chain I shopped -- your instructions could be very different from mine.
DO NOT mention the name of the chain you shopped -- it would be a violation of board policy to mention it connected to the MSC who has the job. Which is why I can't tell you who I shopped either.
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I pray it does not occur that the last thing I did before I died was vacuum the house or eat broccoli.