I haven't had any problems with Expedia - in fact, the service that I have received has been outstanding. I have purchased over 30 tickets from them so far.

When I have called them with problems, they are quick, attentive and been very pleasant. Are you calling the right number? The number I have is: 1-800-936-4500 or 404-728-8787

Ditto with emails - I have experienced no problems there.