Until now, I have used Expedia for years with only a minor incident. I recently had to make flight changes. The Agent seemed very helpful. The agent led me to believe my new cost was an increas of $524 and then I find they refuse credit the old itineray. My cost went from $836 to $1900. Expedia policy states they will provide a comprehensive summary of all charges before any change is made. They are claiming the email 13 days later is the comprehensive summary. Try to envoy a vacation on your new budget.