Im trying to make it so I can refund the materials from the /remove but not have a cost that goes along with it. 
This is my .json for reference. If anyone can help me figure out why the cost still stays let me know.  

Moderator edit: Please use the code {;} block when sharing large portions of text such as config files.

I  dont know if i have to change the .cs file or what. I've spent the past hour trying to figure this out and cant. Any help goes a long way

You never do anything to the .cs file, That is what the config is for,
As far as i can see you change this line to "false" (in the config file)
"Remove - GUI - Price": true,
and change the price values in the config list to 0 (zero) then save and reload plugin with
oxide.reload RemoverTool
See how you go , its just a guess on my part as i have not changed mine from default.