I know for a fact that in the past their system has automatically generated reward certificates on a timed basis - effectively wasting 25Kish points I had stored. I complained in passing to a nearby store manager about it and was just told that I'd have to keep up on it, as their system is continually updating (getting worse, he should have said).
I'm almost certain that I looked through my past emails and was given no notice that the above had happened, also. I believe it was just done internally on their website, and no notifications were given solely to blow through the points of cheap-asses like myself.
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