About the change of data on facebook:
  1. Go to contact under your purchased or exchanged page;
  2. Next, My Settings;
  3. General;
  4. The first thing you need to do is to change your phone number. (Why phone first?) Because the phone will be notified of the change, you do not want the previous owner of the page to know your new details. Even though the guarantor changes everything, you still have to take precautions;
  5. Change mail;
  6. Change the password for the page;
  7. Then go a little lower and find "security of your page";
  8. Your task is to click on End All Sessions;