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Not sure if this has been said in a thread yet, but here's a new response I got today.
For those of you who are eligible but haven't gotten your RP refunded yet.
akMitsu, Oct-03 14:41 (PDT):
Thank you for contacting the League of Legends Player Support. At this time, we are continuing to investigate the qualifications for the Mac Beta refund. Once we have completed our investigation, we will be in touch with you in a timely manner. I understand this may be frustrating for you, and I would like to express my apologies.
Thank you for the patience you have expressed regarding this situation.