How to get a refund on a auto-completed,rejected order?

How to get a refund on a auto-completed,rejected order?

I order this: "ahmedjadoon will give you 3 BEST Traffic Bots EVER to Boost your Alexa and much more!! for $13"

I got the order and the first one I tried to open set off my anti-virus. I quickly deleted and was worried to even try the other two softwares. I rejected the order then complained to the seller, his response was what about the other two. I responded after the AV warning I was worried to open anything else and besides I ordered 3 and should not have to settle for less and infect my computer. He sent again, I rejected again but because I was at the hospital and could not get to my computer this order auto-completed. How do I get a refund? This seller does not deserve a little of my money, shows his character since he knew I rejected twice and why.

Mad as Hell!!!