Only $1800? I'm sorry, OP, but that is peanuts compared to some of the other quotes I have seen for situations similar to yours.
Same thing I thought, chump change, compared to others I've seen also.
For some one working in IT and probably being some what literate/savvy on the net, you should've known better than to just take someone's word over the phone that the distance wouldn't be an issue. Especially since you're dealing with Charter!