Price Adjustment to Website Error with Coupon

Which is the right department to call to make a price adjustment to an order for a Dell outlet Latitude computer. I've literally talked to 10 different people and been shuffled back and forth constantly. Dell Outlet sales transfers me to the Returns dept. Returns say then can't make an adjustment for refurbished computers and Sales has to cancel the order and place a new one. Sales then says this is a matter for the Returns department.

The adjustment is for a coupon that was on the the Dell website which I clicked to get a list of systems. When checking out, the coupon wouldn't apply. After a long chat with an agent, he says he is getting a message saying the coupon has expired even though it clearly hadn't. He told me to place the order on Saturday and then have Dell make an adjustment on Monday.