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You would need to sod a written demand and notice of claim to USCIS describing the events, what you have been told and what you did prior to them being turned around and sent back. You need to demand the cost of the flights and all of your losses suffered and demand they reimburse you for the expenses based on their negligence.
If they refuse your demand, I am afraid that you are going to have no choice but to sue them for their violation of the immigration law and refusing them entry when they met all of the legal immigration entry requirements. This suit against USCIS CBP would have to be brought in federal court
and you will need to engage a local attorney to do so.
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