The retainer should be worn after the teeth are completely corrected. It is impossible to wear the retainer directly without correction. Which hospital is so irresponsible? Find his leader and tell them that it is impossible to pay them any more, but they should continue their treatment until their teeth are neat. If this doctor is not skilled, ask the leader to arrange another doctor, but no more fees can be charged. Just ask him, what is a retainer? Shouldn't the retainer keep it? Correction is not in place, leave a fart! It means this treatment is not over yet. How can I pay again? Did you sign a treatment agreement? How long do they promise to be corrected? If it is best to sign, if not, if they cheat, if there is a superior unit, find their superior unit. If not, it's a private clinic. You have to talk to your doctor and his leader every day. Let their patients see how bad their skills and medical ethics are! I guess they are also afraid of affecting business. I hope I can help you.