So after posting this thread on this forum, nobody seems to know how to chargeback artix or one of their many resellers.
I spent a lot of time but I finally found a way to do so.
Artix accepts MGC (Multi Game Card) as a payment method. While I don't know if buying straight from their site is wiser, I just bought one off G2A.
And as most of you know, G2A is an easy chargeback - I just opened a dispute both on paypal and their support. The weird thing is that G2A actually replied to the paypal dispute by saying that they will solve it with their support blah blah blah.
I went to MGC website and entered the check balance option to show them proof - and here's comes the shock : The website says the card is INVALID although it's an actual card ! so I used that to my advantage, and now I'm hoping for the best. I know I will win the paypal dispute, but I wonder if they will issue me a replacement.
Anyhow, to cheapskates among you - you now know how to chargeback artix. If anyone knows another way, be sure to tell us.
I will update.