How do i report someone in this situation

[michaelpwnsu]

we mostly chatted over sythe and then on steam. I sold him a csgo item for his paypal, and today he refunded the money. I also deleted him off my steam friends list after the trade was completed. Is there any way i can get then banned on here

 

Show sythe pms, any skype conversations, show that the date is relevant to the chargebacks and you should be good to go.