Sorry to hear your about troubles. As mentioned above all RV's are a piece of junk made to last a few years at best.
Two out of the 6 or 7 trailers I've owned were Keystone. Keystone is the absolute worst. Keystone has a very bad structural design flaw in the header above their slides. They will always leak above the slide and if you don't catch it quick enough, you will have structural damage that will cost thousands if you can't do the repairs yourself.
Don't waste time with a salesman at the dealership, only speak to the general manager. Let him know you expect timely updates from him on what is being done.It is best to get his email and converse that way so you will have written documentation.The dealer can only do what keystone will allow.It does take some time to get issues like this resolved because I'm sure the factory is dealing with dozens of issues like this every day. But make sure you get a good feeling that the dealer is on your side and be firm about getting regular updates on what is being done. Remember, the squeaky wheel always gets the grease.