Disputes between RIRs and their customers do occur from time to time, and it is best that such disputes are resolved within that RIR, its community, and/or the applicable legal and courts system if necessary.
ARIN does not normally comment on disputes or related litigation occurring at another RIR, but this matter has become quite different, as it is both highly public and has potential for significant impact to the overall stability of the Internet number registry system and thus to ARIN and its community.