I was promised a $100 rebate from my sales Rep

I was promised by my sales rep I was going to get a $100 rebate. I filled out the form and I just received a letter from the customer affairs dept  stating the following

Unfortunately we are unable to honor your request as our records indicate that you did not order and upgrade to a new purchased Hughesnet Gen4 system directly from Hughes.

I have a Gen4 system and the sales rep told me when i ordered it I would receive this rebate.