Now that you've returned the item you purchased from this scam company, a new chapter begins.
The money that you spent for shipping. Might as well consider that gone. They don't care what you paid for initial shipping and then return shipping of the product to them. You just ate it, according them. Only recourse, contact the USPS Postal inspectors office and report the fraud they're doing while using the Postal Service.
Don't have any dealing with this company, or it's products.