All of Keystone's contact information is here:
http://www.keystonerv.com/customer-service
There is also a link to send email correspondence. Remember, if, when it's all "said and done" you don't have a physical copy to prove what you said, phone calls won't really do much to prove you ever contacted Keystone. You might want to use email so you have a record of what was discussed and what was promised......