I think the OPs expectations may be unreasonable, at least unrealistic. The first trip they couldn't take a nap due to the noise of kids walking, maybe running, in the room above them. Rooms aren't soundproof enough, issue is getting worse as Disney is getting rid of carpeting. For future stays OP needs to request top floor. May need some kind of ear plugs. Alternately pick a more quiet resort, possibly offsite. Kids walking, and even running, during daylight hours is the nature of the beast.
Second stay. Kids melt down. Sounds like parents got the kid quiet before 10p. Not perfect but not horrible. I wouldn't be happy but a one hour meltdown is kind of par for the course.
I don't agree with some of the suggestions. Claiming child abuse, based on what was posted, is wrong for reasons mentioned by other posters. Of course call first. It doesn't really matter where the call is answered. The person who answers the phone needs to forward you issue to the right person. The person who is ultimately going to help you isn't a person who answers the phone at the front desk (some resorts) or in a remote call center (Disney resorts).