Am I being overcharged?

I was trying to refinance my mortgage, but then I decided to sell the property instead and cancelled the refinancing process. My agent first told me I would have to pay about $ 800 in fees for the services that had been provided, including the appraisal. Now he’s telling me that the charge could be as much as $ 2500. I think they are trying to rip me off, but then I don’t now what the typical prices are in this case.