Relocation Companies

WOW! We finally have the relocation home sold.  I am working with a new company called Cartus.  So far they have been a real pain in the you know what.  They jump all over me to get the initial paper work in so that they can get their 40% commission.  Yes I did say 40%.  This is just plain robbery.  Anyway, now that I have an offer, the Cartus representative will not return my call for additional information on how to turn in this offer.  they have to approve all offers on the home.  I am really frustrated with them.  have any of you dealt with this company before?  RE/MAX