Worried the dementia care facility is not staffed properly

My Dad has been in a dementia/memory care facility for ONLY two weeks now. He has mild/moderate alzheimers. He appears to have forgotten the basics of going to the toilet safely and has regressed noticably. The staff said this is normal and an adjustment. Since its "assisted" only, not a nursing home, he is supposed to pull the emergency cord for assistance when he has to go to the toilet or for other needs...how in the world does this place think people with dementia are going to REMEMBER to do that??? We are sick with worry that he will fall while trying to pull his pants down (wears Depends) unassisted. He has night terrors as well, saying people are getting in his room. My mother wants to pull him out and bring him back home, she said it wasn't that bad taking care of him. Anyone have advice for me? What should I ask for? What is a good ratio of staff to resident at these places? They have only 3 for 24-26 residents! Im so stressed calling and complaining and checking every day (I live out of town) I think I will lose MY mind!