I have some news - after reading this thread this morning (and posting my update), I sent this email to them:
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Dear David and Marguerite,
I am following up again to check on the status of the payment. Marguerite said that it was supposed to go out at the end of August, but I did not receive it. I also did not hear back from my email last week. I have been advised by fellow mystery shoppers to file a complaint with the Federal Trade Commission as well as the Florida Attorney General's Office, but I truly do not want to resort to that. I am hopeful that I can receive a response to this email by the end of this week, and be paid by next week.
Please let me know if there is anything further that I should do to receive payment, and when it will likely go through. Thank you so much!
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And within two minutes, I received this email from Marguerite:
Your payment was processed yesterday. You should see it in your account in the next day or two.
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I will keep you posted as to whether it actually goes through. I'm hoping it does!