I'll share a mystery shop I did today. I'll change some things about the guidelines, rewrite them so not to violate confidentiality.
Instructions state at this location the shop is a two parter. I was supposed to let them know 24 hours in advance to add the second report.
Instructions. If you are visiting this location, a (second part shop) is REQUIRED. you will need to have the 2nd report added to your account (24 hours in advance.)
I flubbed the 24 hour rule. Sent the email 1/2 hour beforehand, figured I would eat the cost of the second shop I could not complete the second shop report. . However, after I finished the shops, I get an email stating this was a spot check and the 1st shop was only necessary. I replied that the instructions state the 2nd one was required. Reply was, the 24 hour instruction was to add the report and to tell me if the 2nd shop needed to be done.
Unfortunately for me, this was not stated in the guidelines at all, only to add the 2nd report.
Beware the Jabberwocky.
Do not read so much, look about you and think of what you see there.
Richard Feynman-- letter to Ashok Arora, 4 January 1967, published in Perfectly Reasonable Deviations from the Beaten Track (2005) p. 230