@Ja***
, even for a high end paper-pushing visa agency that figure is way out of whack as far as what companies are charging.
They can go out to the immigration office and get the sheet that lists the requirements for you to get first a 90 day Non-O visa and then a yearly extension of stay.
Also keep in mind we have a no recommendation of visa agencies in thailand on the group. It's set up so people can ask questions and push their own paper.