I didn't cause it. Someone else used their dirty shirt to clean the phone without my permission. I have been extremely careful with my phone.
I don't care too much if they don't refund it as I love the jet black however I believe I can be careful and those scratches would not have come if it weren't for that guy.
Honestly, how old are you? You did cause it because the item belongs to you and you are responsible for it. End of.