Whether you can do anything about this in a lawsuit will depend on whether the twins are okay. Hopefully, they are fine and you don't need to worry about them. It is much better to have healthy kiddos than a good lawsuit. If they suffered injury from low oxygen that would be another matter. So, keep asking questions and talking to the neonatologists and pediatricians to stay on top of their condition. If they have suffered an injury then be sure and contact an experienced birth injury lawyer to investigate and see if a lawsuit is necessary or feasible. On another note, since your kiddos were born at 33 weeks they will need eye exams by a competent pediatric ophthalmologist to see if they are developing an eye condition called Retinopathy of Prematurity. You may have received written information such as a brochure already. Be sure to ask who is doing the exams, when, and what the follow-up exam schedule is going to be. Be sure to ask details about the findings at each exam and if they require treatment [some do and some do not]. If you stay on top of this and ask questions the staff will be more diligent about assuring the exams and any treatments are done on time.
Good luck to you and your kiddos.
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It certainly sounds like you were treated very callously. However, in order to bring a claim you must prove that the care was not only below the standard of care but also that the substandard care caused permanent damages. If you have no permanent damages and your baby is okay then you would likely spend more than you could recover. I am truly sorry for your experience. For more specific advice call a local attorney.