Modern Life Trend review: Adding an item to my order

I ordered 1 power saver device and told my card company it was legit, The order was processed and later another $9.99 was added. I contacted Modern Life immediately and was told they were busy and someone would reply. After 24 hours I again e-mailed them with the same answer. 6 back and fourths with out any solution I sent all info to my card company for disputing the charge. About 20 minutes later Modern Life Trend sent me an e-mail explaining that this item of $9,99 was a mystery girt that I could cancel and not be charged. This note was received 10 days after the order was placed and 4 days after the order was received. I sent them a note stating that I expect a postage paid package to be sent for the return or I would junk it. My card company is working on my complaint and removing the charge from my account as of minutes ago.