Good Luck with that. I would not go that far on suing them because its just a matter of misunderstandings. I would just a write a letter to the Head of CBP at the concerned post. Until and unless you carry a American passport, we would be harassed for little to big immigration task. It could just be renewing your driver's license to filing Immigration benefits such as I 140, I-485. Just know that if you are travelling to area were illegal immigrants are rampant, Please carry proper form of visa, I 20 or continous enrollment letter from DSO.