Would this action not have put them in breach of contract? Could you not seek a termination of said contract, with subsequent loss of their 'rights' to your paper, as well as costs and compensation to yourself for both the breach and the implied dafamation? Also wouldn't there also be a spurious takedown which might help you in the other a rguments?
then you should care about the code, as well. Choice of language can have a lot of consequences for accuracy and floating rounding errors need to be accounted for, and these may differ per language and implementation version of each language.
...does it make data storage more palatable, or should the claim be taken with a pinch of salt...
I cannot imagine that the parent company cannot contractually discipline a franchise should they bring the brand into disrepute.
Unless the brand owner takes action to disassociate itself from this action and withdraw support from this franchise, I will not set foot in any branch or franchise of this company world-wide because I need to know that I can exercise my rights to share my fair opinions without threat of legal action should I get bad service.